BIO120H1 Lecture : Bio lab 6 notes Dec 2 2009

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Phenotype j the out appearance j importanc ein the process of evolution. Evolution in population depends on phenotypic traits being passed down from generation to generation. J howver, is genotype the basic that cause the change. The genotype is the complete genetic constitution of an organism. When the phenotype is change in a population, it may results from the interaction between genotype and the environment. Alternation of the phenotyoe in individual is called acclimation. Note that its not a adapation, adaptation is the term used for population not for individual! Phenotypic plasticity is the concept used by biologists to describe the degree to which a given genotype can alter its phenotypoc expression in order to acclimate to irs surroundings. Reaction norm: the relationship between the environment and the trait in question. 1st, insufficient genetic variation exists for the evolution of plasticity to occur.

Related Questions

1. Late stage succession communities typically: a) contain more equilibrial than opportunistic species b) are more diverse than disturbed communities c) are more diverse than early stage succession commmunities d) contain more opportunistic species than equilibrial species e) suffer higher rates of disturbance

2. Phenotypic plasticity is when: a) Organisms adapt their genotype to the local environment b) Individuals with different phenotypes show plasticity in their size c) Organisms with different genotype express different phenotypes in the same environment d) Plasticity in the environment causes different genotypes to survive leading to different phenotypes e) Organisms express different phenotypes depending on the local environment but have the same genotype

3. Terrestrial areas that are saturated with water, either permanently or seasonally, are typically known as what type of ecosystem. f) Grasslands g) Heathlands h) Litholands i) Wetlands j) Littoral

4. Briefly explain two ways that excess climate gas emissions are changing the worldâs physical environment

1. What does it mean to have phenotypic plasticity? What is the relationship between developmental plasticity and behavioral plasticity? What are the costs and benefits of evolving plasticity? What is the role of the environment? Of trade-offs?

2. What is a reaction norm, and what does it tell us about phenotypic plasticity? Give an example of how this might work

44.Why donât similar genotypes always produce the same phenotype?

A. Parent alter their phenotype and pass on this phenotype to progeny

B. Phenotype is the product of many environmental influences

C. Genetic variations of ADH enzyme produce the same phenotype

D. Animals display different phenotypes dependent on diet, not genotype

46.Which of the following attributes has the least effect on the contribution an individual makes to the gene pool of the next generation?

A. spas of mating privileges

B. more efficient at obtaining food

C. produces more offspring

D. camouflage from predators

47.âUntil the agricultural evolution 10,000 years ago, people used to live in small populations with little gene flow between them. That is the best situation for rapid evolution.â said Sewall Wright. one of the founders of population genetics. This conclusion on gene flow conflicts with Hardy Weinberg equilibrium, which states that no gene flow means

A. natural selection

B. no evolution

C. no random mating

D. no genetic drift

58 Larval flies (maggots) express the Ubx gene in all of their segments, and thereby lack appendages. If this same gene continued to be expressed throughout subsequent developmental stages, except in the head region, and if the result was a fit, sexually mature organism that still strongly resembled a maggot, this would be an example of

A. homochrony

B. exaptation

C. paedomorphosis.

D. adaptive radiation

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BIO120H1 Lecture : Bio lab 6 notes Dec 2 2009

BIO120H1 Full Course Notes

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