Biology 1201A Lecture 10: BIO 10

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ivoryraccoon659

7 Feb 2017

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Changes in the allele frequencies due to the effect of chance in small samples. Each generation present today is a sample of the gene pool of the alleles in the previous generation. This means that we can lose alleles and fixation (all alleles are gone except 1) can occur. Results in fixation in the long term (if no opposing evolutionary. And if the allele frequencies of that remain are different than the original, then the gene pool changes and the next generation can have an (over time and reduction of population size) (cid:862)fou(cid:374)de(cid:396) effe(cid:272)ts(cid:863) that (cid:272)(cid:396)eate (cid:374)e(cid:449) populatio(cid:374) f(cid:396)o(cid:373) a s(cid:373)all sa(cid:373)ple- if alleles that they carry are different in frequencies compared (new population made from a sample of the main population) The bigger the sample size, the less likely it is for fixation to occur. If nothing else is going on, fixation will always occur. The lower the frequency- the population ends up fixing by losing the allele-

Related Questions

*Selection*	*Term*	*Description*
	Basal factors	a. bind to enhancers
	Activators	b. bind to promoters
	Coactivators	c. bind to activators
	Locus control region	d. large enzymatic complex found in the cytoplasm of alleukaryotic cells that down-regulates gene expression
	RISC	e. influences transcription from multiple genes linked over alarge region of DNA

*Selection*	*Term*	*Description*
	Gene pool	a. The process in which rare alleles increase in frequency in anew population
	Genetic drift	b. The sum total of all alleles carried in all members of apopulation
	Founder effect	c. The proportion of all copies of a gene in a population of aspecific type
	Evolutionary equilibrium	d. Unpredictable, chance fluctuation in allele frequency thathave a neutral effect on fitness
	Allele frequency	e. a balance between a new allele and selection against thatallele

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11.The evolutionary force of drift changes allele frequencies more quickly in which of the following kinds of populations?

a. large populations

b. small populations

10.Larger populations generate larger numbers of mutations.

True

False

9.Overdominance can result in changes in genotype frequencies, without changes in allele frequencies.

True

False

8.Protein coding genes usually evolve faster than pseudogenes.

True

False

7.Favorable mutations are not directly induced by environmenntal conditions where they increase fitness, instead they occur by chance, and if they happen to increase fitness, their frequency will increase in a population.

True

False

6.Consider a single gene with two alleles, A and a, in a population. What is the frequency of the Aa genotypes in zygotes drawn from a gene pool where A=0.3 and a=0.7, if they are in Hardy-Weinberg proportions?

1. 0.3

2. .09

3. 0.49

4. 0.42

5. 0.7

I need this in 15 min!Please help!!!1

A gene in a population of sexually reproducing organisms with the following genotype frequencies is at Hardy-Weinberg Equilibrium: BB 100, Bb 800, bb 100

A) true B)false C) can not be determined

Which of the following evolutionary forces would be the best explanation for the genotype frequencies in the population in the above question?

A) genetic drift B) there are no evolutionary forces acting on this gene population C)assortive mating D) Overdominance E)Directional selection

If a population is at Hardy-Weinberg equilibrium, which of the following allele frequencies would yield the smallest number of heterozygotes? A)

A=0.25, B=0.75 B) A=0.75, B=0.25

C)A=0.50, B=0.50

D)A=0.10, B=0.90

Fixation occurs when one allele becomes the only allele for a gene in a population, meaning that all other alleles for that gene have been lost. True or false

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Biology 1201A Lecture 10: BIO 10

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