Genetic drift would be strongest in...a population of 500,000 individuals.of 500 individuals.O a populationa populationof 50,000 individuals.a population of 5,000 individuals.O a population of 50 individuals.

Out of the options provided, genetic drift would be strongest in:c) a population of 50…

Genetic drift would be strongest in... O O a population of 500,000 individuals. a population of 500 individuals. a population a population a population of 50 individuals. of 50,000 individuals. of 5,000 individuals.

Genetic drift would be strongest in... O O a population of 500,000 individuals. a population of 500 individuals. a population a population a population of 50 individuals. of 50,000 individuals. of 5,000 individuals.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter11: Evolution And Its Processes

Section: Chapter Questions

Problem 6RQ: Galapagos medium ground finches are found on Santa Cruz and San Cristóbal islands, which are...

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Concept explainers

Genetic Variation

Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.

Quantitative Genetics

Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.

Question

Genetic drift would be strongest in...
a population of 500,000 individuals.
of 500 individuals.
O a population
a population
of 50,000 individuals.
a population of 5,000 individuals.
O a population of 50 individuals.

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Small population size causes genetic drift because ofchance sampling of different alleles from one generation to the next. We can predict how much geneticdrift occurs for a given population size using binomialsampling statistics. With a population of size N, wecan estimate that 95% of the time the allele frequency(p) in the next generation will be withinthe confidence interval of p ± 1.96 (√p(1 − p)2N ),where p(1 − p)2Nis an estimate of the statistical variancein allele frequencies from one generation to the nextwith random sampling of 2N alleles each generation. a. What is the confidence interval for p = 0.5 whenN = 100,000?b. What is the confidence interval for p = 0.5 whenN = 10?c. How are the results in parts (a) and (b) related tothe consequences of a population bottleneck?
Three basic predictions underlie genetic drift in populations: (1) As long as the population size is finite,some level of genetic drift will occur; thus, withoutnew mutations, all variation will drift either to fixationor to loss. (2) Drift happens faster in small populationsthan in large populations. (3) The probability that anallele is fixed (goes to a frequency of 1.0) is equal toits initial frequency (p) in the population, while itsprobability of loss from the population due to drift isequal to 1 − p. Given these three predictions:a. What is the allele frequency of a new autosomalmutation immediately after it occurs in a diploidpopulation of size N = 100,000?b. What is the allele frequency of a new autosomalmutation immediately after it occurs in a diploidpopulation of size N = 10?c. In which population does the new mutation have ahigher probability of going to fixation by chancewith genetic drift?
Below are individuals in a population broken down by genotype. (A) Complete the table AA Aa aa Total # individuals 305 650 55 # A alleles # a alleles (B) Determine the frequency of alleles A and a. Show your work. (C) Assuming the population is in Hardy-Weinberg equilibrium, determine the number of heterozygous individuals in the next generation with a population of 1200.
You sample a population of blue-bellied lizards in the Mexican desert. You calculate allele frequencies to be 0.42 (A1) and 0.58 (A2). You genotype 1000 individuals, and discover that 130 are homozygous for the A, allele, 290 are homozygous for the A2 allele, and 580 are heterozygous. O No, this population is not in genetic equilibrium because there are more homozygotes and fewer heterozygotes than predicted under Hardy Weinberg equilibrium. O No, this population is not in genetic equilibrium because there are more heterozygotes and fewer homozygotes than predicted under Hardy Weinberg equilibrium. Yes, this population is in genetic equilibrium because allele frequencies are not changing. Yes, this population is in genetic equilibrium because the observed genotype frequencies match those that are predicted under Hardy Weinberg equilibrium.
How Can We Measure Allele Frequencies in Populations? The MN blood group is a single-gene, two-allele system in which each allele is codominant. Why are such codominant alleles ideal for studies of allele frequencies in a population?
Galapagos medium ground finches are found on Santa Cruz and San Cristóbal islands, which are separated by about 100 km of ocean. Occasionally, individuals from either island fly to the other island to stay. This can alter the allele frequencies of the population through which of the following mechanisms? a. natural selection b. genetic drift c. gene flow d. mutation
Why the impact of genetic drift is more significant in smaller population?
Genetic drift is most likely to affect:a. every population, regardless of sizeb. small populationsc. large populationsd. large and diverse communities
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