BISC 102 Lecture Notes - Lecture 9: Allele Frequency, Gene Pool, Microevolution

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apricotmarten436

12 Nov 2018

School

Simon Fraser University

Department

Biological Sciences

Course

BISC 102

Professor

Ivona Mladenovic

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Document Summary

Evolution by natural selection: difference in phenotypes in a population, the phenotypic variation is heritable, the variation in phenotypic trait differs in fitness. Changes within species = changes in allele frequencies. Number and forms of species = among species not individuals: speciation the evolution of new species. Gene pool: the total sum of all alleles in a population at one time, consists of all big variables alone with small variables on their own, described by allele frequency, gene pool concept map. Gene pools are collection of all alleles. Gene pools described by allele frequencies. Gene pools have hardy weinberg principle. Allele frequency: number of one type of allele relative to the total number of alleles present in the population. At the same gene position on a chromosome. Hardy weinberg principle fundamental claims: allele frequencies are given by p2, pq, q2 p2 = aa pq = aa q2 = aa, the frequencies of these alleles do not change over time.

Related Questions

Evolution is change over ____________. Why is evolution an important concept in biology?

What is a population? How can you identify a population in nature?

What is the ultimate source of random variation in a population? Is this the only source of variation, why or why not?

What is a gene pool? Why is it important to our study of evolution?

How is variation inherited in a population? HINT: There are at least two main contributors to this variation. You should be focusing on gametes!

What is microevolution versus macroevolution?

How do the peppered moths show us microevolution in nature? Why is this NOT macroevolution? HINT: you should consider alleles and mating in your answer.

Do you believe that the Hardy-Weinberg equilibrium is common in nature? Why or why not? In your answer, you should incorporate your knowledge of populations, evolution, and genetics.

Evolution is driven by adaptation and natural selection. In populations, we refer to organisms that are âmost fit.â Explain how evolution and the environment would result in organisms that are âmost fit.â In your answer, indicate whether the âmost fitâ organism today is likely to be the âmost fitâ organism in the future and why.

Microevolution is a change in the frequency of ___________________ in a population but has not resulted in a speciation event thus far. Given this, what factors could lead to a speciation event for this population?

How would you know that a population had divided into two different species (macroevolution)? How could you test for a speciation event experimentally?

u have to creating 2 multiple choice questions, (based on those information). You create 2 multiple choice questions , with a brief description at least 5-9 sentences for each question on why you think they are a corect answer and why you think it is good questions.

-Microevolution: evolution occurring within populations â
Adaptive and neutral changes in allele frequencies.
-Macroevolution: evolution above the species level â
Origination, diversification, and extinction.

-The Motors of Macroevolution: Speciation and Extinction

Speciation and extinction rates produce changing levels of diversity.

Interplay between speciation and extinction determines diversity

D1 (diversity) + originations â extinctions = D2 (new diversity)

Which of the following statements is true about the theory of evolution?

The focus of the theory of evolution is to explain the origins of life.

According to the theory of evolution, life evolved entirely randomly.

The focus of the theory of evolution is to explain how life diversified from the first living cells.

According the theory of evolution, only the strongest and toughest can survive.

Which of the following best explains our current understanding of microevolution?

Neither microevolution nor macroevolution can be observed within a human lifespan?

Microevolution is the gradual change of the genetic makeup (allele frequency) of a population over time.

Microevolution and macroevolution occur by very different mechanisms

Microevolution is the evolution of small organisms; macroevolution is the evolution of large organisms.

The Irish elk is a giant species of deer that went extinct about 5,000 B.C. They are well-known for their extremely large antlers (12 feet wide) in males. The antlers likely played some role in protection against predators, but another possible cause for their large size could be

blending genetics

sexual selection

spontaneous generation

inheritance of acquired characteristics

Cross River gorilla is listed as critically endangered species. With only 35 of these gorillas in the world, they are at risk of extinction largely due to poaching and loss to diseases such as Ebola. Genetic studies of the remaining gorillas show very little variability, because several alleles were likely lost due to ______.

		genetic drift
		gene flow
		increased rate of spontaneous mutations
		adaptive radiation

BISC 102 Lecture Notes - Lecture 9: Allele Frequency, Gene Pool, Microevolution

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