BIOL1003 Lecture Notes - Lecture 8: Anemia, Heterozygote Advantage, Allele Frequency

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1 Jul 2018

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Types of Selection

• Power of selection can be seen through the work of animal and plant breeders

who change the forms of organisms to either improve their value as food, or to

satisfy an aesthetic impulse

• Different from natural selection which works on generation-to-generation

differences in survival and fecundity without any overall long-term goal

• Artificial selection- animal and plant breeders with a long-term goal in mind

• Examples

oBrassica oleracea (wild mustard) has been separately selected for

increased leaves in the basal rosette (cabbage), increased leaves from the

stem (Brussel sprouts), increased thickness of the lower stem (kohlrabi)

and size and colours of the flowers (cauliflower and broccoli)- all of which

are different varieties of the same species

oDogs have been selected for extremely diverse traits including size,

temperament, behaviour, ability to understand human gestures and

commands

oCoevolution- each species selects for traits in the other species that can

lead to two species appearing to have hatched a plan to work together or

work against each other e.g. ants eating farm fungus that is more

nutritious, hosts and parasites

• Types of selection based on which part of the range of forms (phenotypes) are

discriminated against

oDirectional selection- selection for one extreme

Tends to be on traits in populations that are placed in a new

environment, or when there is a rapid environmental change so

that the current environment does not resemble the historic

environment

E.g. Beak size in Galapagos finches, selection on genes (like CCR5

delta 32) that reduce the likelihood of HIV infection developing

into AIDS, peppered moth

oStabilising selection- selection against extremes

Generally occurs on traits in populations that have been in the

same environment for a long time

E.g. birth weight in humans and offspring sex ratios

oDiversifying or disruptive selection- selection for extremes

Common along geographic gradients, where a jack-of-all-trades is

a master of none

Demonstrates that the direction and form of selection can be

context-specific

Discrete morphs are often the result of phenotypic plasticity- the

same genotype develops differently depending on the

environment

E.g. tadpoles that specialise on eating plant material or only eating

brine shrimp, seed-cracker finches that either have large or small

beaks

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Document Summary

Types of selection based on which part of the range of forms (phenotypes) are discriminated against: directional selection- selection for one extreme. Tends to be on traits in populations that are placed in a new environment, or when there is a rapid environmental change so that the current environment does not resemble the historic environment. Beak size in galapagos finches, selection on genes (like ccr5 delta 32) that reduce the likelihood of hiv infection developing into aids, peppered moth: stabilising selection- selection against extremes. Generally occurs on traits in populations that have been in the same environment for a long time. E. g. birth weight in humans and offspring sex ratios: diversifying or disruptive selection- selection for extremes. Common along geographic gradients, where a jack-of-all-trades is a master of none. Demonstrates that the direction and form of selection can be context-specific. Discrete morphs are often the result of phenotypic plasticity- the same genotype develops differently depending on the environment.

Related Questions

Please answer all the questions

In what way did Harlanâs theory give rise to Diamondâs theory?

It recognized agriculture might have developed by different mechanisms in different parts of the world.

Both make the assumption that hunter-gatherers were (and still are) superior to agriculturists.

It recognized the reason agriculture did not develop in certain parts of the world was because people lacked the intelligence or skill.

It is a basic case of scientific plagiarism - Diamonds theory is identical to Harlans theory.

It recognized that agricultural societies were healthier and better fed than hunter-gatherer societies.

If a plant can grow well all by itself in the wild, yet still retains desirable agronomic traits, the plant is ____________________.

Choose the single best answer

The inability of plants to move makes it difficult for them to:

Disperse seeds, defend themselves, and create oxygen.

Disperse seeds.

Disperse seeds and defend themselves.

Create oxygen.

Defend themselves.

Vavilov hypothesized that in a crop plant's area of origin we should expect:

Greater diversity for trans-domesticated species, but lower diversity for species domesticated in their area of origin.

Greater genetic diversity than in areas outside of the plant's area of origin.

Lower genetic diversity than in areas outside of the plant's area of origin.

Lower diversity for trans-domesticated species, but greater diversity for species domesticated in their area of origin.

Greater herbivore damage because of increased genetic diversity.

Brussel sprouts, cabbage, broccoli and cauliflower are all different varieties of the same species, Brassica oleracea. This group of plants demonstrates that crop breeding can lead to:

Low within variety and high between variety diversity

High within variety and low between variety diversity

Low within variety diversity

High within variety and high between variety diversity

High between variety diversity

______________________ compounds are produced by plants, but are not necessary for the plant's immediate survival. However, they often help protect plants from being eaten.

In discussing the origin of agriculture, the term demographic stress refers to:

Lower productivity of un-cultivated plants due to late-Pleistocene cooling.

A higher incidence of religious practice in societies following the transition from hunting and gathering to agriculture.

The situation where human populations are greater than the carrying capacity of the environment.

Hobbes's assertion that hunter-gatherer groups did not posses the knowledge or skills to develop agriculture.

That the stresses on pre-domesticated plant species led to the development of traits that result in the "domestication syndromeâ

skyturtle265

In what way did Harlanâs theory give rise to Diamondâs theory?

It recognized agriculture might have developed by different mechanisms in different parts of the world.

Both make the assumption that hunter-gatherers were (and still are) superior to agriculturists.

It recognized the reason agriculture did not develop in certain parts of the world was because people lacked the intelligence or skill.

It is a basic case of scientific plagiarism - Diamonds theory is identical to Harlans theory.

It recognized that agricultural societies were healthier and better fed than hunter-gatherer societies.

What is the difference between classically bred varieties and landraces?

Landraces are not edible by humans; classical bred crops can be eaten

Landraces are grown in dry conditions; classically bred crops are wetland species

Landraces are often (though not always) developed by unintentional processes; classically bred crops are developed by intentionally breeding for desired traits using modern techniques

Landraces cannot be harvested using domesticated animals; classically bred crops can be harvested using domesticated animals.

Landraces have no means of seed dispersal; classically bred crops can readily disperse their seeds

Which of the following types of agriculture can be practiced in an urban setting?

Vertical farms

Community gardens

Alternative farms (crickets, caterpillars, other arthropods)

All of these types of agriculture can be practiced in an urban setting

CSA farms

If a plant can grow well all by itself in the wild, yet still retains desirable agronomic traits, the plant is ____________________.

Plant species that rely on _______ pollination produce much more pollen than those using other methods.

Choose the single best answer

The inability of plants to move makes it difficult for them to:

Disperse seeds, defend themselves, and create oxygen.

Disperse seeds.

Disperse seeds and defend themselves.

Create oxygen.

Defend themselves.

Vavilov hypothesized that in a crop plant's area of origin we should expect:

Greater diversity for trans-domesticated species, but lower diversity for species domesticated in their area of origin.

Greater genetic diversity than in areas outside of the plant's area of origin.

Lower genetic diversity than in areas outside of the plant's area of origin.

Lower diversity for trans-domesticated species, but greater diversity for species domesticated in their area of origin.

Greater herbivore damage because of increased genetic diversity.

What is one type of information that can be gathered by archeologists who are studying dental caries (cavities) of ancient populations?

How many children the person had

The time of year the person died

How many conflicts they have been part of

The types of tools used for planting/harvesting grains

The type of plants they may have been consuming

Brussel sprouts, cabbage, broccoli and cauliflower are all different varieties of the same species, Brassica oleracea. This group of plants demonstrates that crop breeding can lead to:

Low within variety and high between variety diversity

High within variety and low between variety diversity

Low within variety diversity

High within variety and high between variety diversity

High between variety diversity

The repeated domestication of grasses (i.e., cereals) and legumes across the globe is likely because:

Early technologies allowed early agriculturalists the ability to communicate with each other over long distances to discuss what plants were best for domestication.

Both already possessed all of the traits needed for domestication

Both contain almost all of the amino acids our bodies need to build proteins.

Human populations were often starving, and needed an additional food source

Only grasses, not legumes, were repeatedly domesticated

Norman Borlaug won the 1970 Nobel Peace Prize for:

Producing the first transgenic plant.

His discovery that plant secondary metabolites play a role in defending plants from insects and diseases.

Creating the FlavrSavr tomato.

His work to create improved, high yield crop varieties that helped to prevent starvation.

His discovery of the area of origin for maize.

______________________ compounds are produced by plants, but are not necessary for the plant's immediate survival. However, they often help protect plants from being eaten.

Which of the following best demonstrates evolution?

A houseplant is moved to a sunnier location and it starts to grow more vigorously.

Your pet walks to the door when it hears your car in the driveway.

Over time, a gene for disease resistance becomes more frequent in a population of plants.

A crop has a higher yield after fertilizer is added.

A giraffe with a longer neck survives a drought year, while one with a shorter neck does not.

In discussing the origin of agriculture, the term demographic stress refers to:

Lower productivity of un-cultivated plants due to late-Pleistocene cooling.

A higher incidence of religious practice in societies following the transition from hunting and gathering to agriculture.

The situation where human populations are greater than the carrying capacity of the environment.

Hobbes's assertion that hunter-gatherer groups did not posses the knowledge or skills to develop agriculture.

That the stresses on pre-domesticated plant species led to the development of traits that result in the "domestication syndromeâ

What is the difference between genetically-modified and transgenic crops?

Genetically-modified crops are produced using modern techniques, while transgenic crops are produced through classical breeding.

Transgenic crops are a type of genetically-modified crops, in which scientists have inserted genes from another species.

Transgenic crops are illegal, while genetically-modified crops are not.

They are the same.

Genetically-modified crops are a type of transgenic crop specifically bred for high yield.

salmonchimpanzee804

Norman Borlaug won the 1970 Nobel Peace Prize for:

His discovery that plant secondary metabolites play a role in defending plants from insects and diseases.

Creating the FlavrSavr tomato.

His discovery of the area of origin for maize.

His work to create improved, high yield crop varieties that helped to prevent starvation.

Producing the first transgenic plant.

Which of the following best demonstrates evolution?

Your pet walks to the door when it hears your car in the driveway.

A crop has a higher yield after fertilizer is added.

Over time, a gene for disease resistance becomes more frequent in a population of plants.

A giraffe with a longer neck survives a drought year, while one with a shorter neck does not.

A houseplant is moved to a sunnier location and it starts to grow more vigorously.

What is the difference between genetically-modified and transgenic crops?

Genetically-modified crops are produced using modern techniques, while transgenic crops are produced through classical breeding.

Transgenic crops are illegal, while genetically-modified crops are not.

Genetically-modified crops are a type of transgenic crop specifically bred for high yield.

Transgenic crops are a type of genetically-modified crops, in which scientists have inserted genes from another species.

They are the same.

The repeated domestication of grasses (i.e., cereals) and legumes across the globe is likely because:

Human populations were often starving, and needed an additional food source

Only grasses, not legumes, were repeatedly domesticated

Early technologies allowed early agriculturalists the ability to communicate with each other over long distances to discuss what plants were best for domestication.

Both already possessed all of the traits needed for domestication

Both contain almost all of the amino acids our bodies need to build proteins.

What is one type of information that can be gathered by archeologists who are studying dental caries (cavities) of ancient populations?

The time of year the person died

How many children the person had

The type of plants they may have been consuming

The types of tools used for planting/harvesting grains

How many conflicts they have been part of

Which of the following types of agriculture can be practiced in an urban setting?

Vertical farms

CSA farms

Alternative farms (crickets, caterpillars, other arthropods)

All of these types of agriculture can be practiced in an urban setting

Community gardens

In discussing the origin of agriculture, the term demographic stress refers to:

That the stresses on pre-domesticated plant species led to the development of traits that result in the "domestication syndromeâ

Lower productivity of un-cultivated plants due to late-Pleistocene cooling.

Hobbes's assertion that hunter-gatherer groups did not posses the knowledge or skills to develop agriculture.

The situation where human populations are greater than the carrying capacity of the environment.

A higher incidence of religious practice in societies following the transition from hunting and gathering to agriculture.

In what way did Harlanâs theory give rise to Diamondâs theory?

It recognized that agricultural societies were healthier and better fed than hunter-gatherer societies.

It recognized agriculture might have developed by different mechanisms in different parts of the world.

It recognized the reason agriculture did not develop in certain parts of the world was because people lacked the intelligence or skill.

Both make the assumption that hunter-gatherers were (and still are) superior to agriculturists.

It is a basic case of scientific plagiarism - Diamonds theory is identical to Harlans theory.

Plant species that rely on _______ pollination produce much more pollen than those using other methods.

Brussel sprouts, cabbage, broccoli and cauliflower are all different varieties of the same species, Brassica oleracea. This group of plants demonstrates that crop breeding can lead to:

Low within variety and high between variety diversity

High between variety diversity

Low within variety diversity

High within variety and high between variety diversity

High within variety and low between variety diversity

If a plant can grow well all by itself in the wild, yet still retains desirable agronomic traits, the plant is ____________________.

Choose the single best answer

The inability of plants to move makes it difficult for them to:

Create oxygen.

Disperse seeds.

Defend themselves.

Disperse seeds and defend themselves.

Disperse seeds, defend themselves, and create oxygen.

Vavilov hypothesized that in a crop plant's area of origin we should expect:

Greater diversity for trans-domesticated species, but lower diversity for species domesticated in their area of origin.

Lower genetic diversity than in areas outside of the plant's area of origin.

Lower diversity for trans-domesticated species, but greater diversity for species domesticated in their area of origin.

Greater herbivore damage because of increased genetic diversity.

Greater genetic diversity than in areas outside of the plant's area of origin.

______________________ compounds are produced by plants, but are not necessary for the plant's immediate survival. However, they often help protect plants from being eaten.

What is the difference between classically bred varieties and landraces?

Landraces cannot be harvested using domesticated animals; classically bred crops can be harvested using domesticated animals.

Landraces have no means of seed dispersal; classically bred crops can readily disperse their seeds

Landraces are grown in dry conditions; classically bred crops are wetland species

Landraces are often (though not always) developed by unintentional processes; classically bred crops are developed by intentionally breeding for desired traits using modern techniques

Landraces are not edible by humans; classical bred crops can be eaten

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BIOL1003 Lecture Notes - Lecture 8: Anemia, Heterozygote Advantage, Allele Frequency

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