Exam 16: How Populations Evolve

Variation within a population is maintained by

The most common source of genetic variation in sexually reproducing organisms is

Which of these conditions is NOT among the requirements of the Hardy-Weinberg equilibrium?

Explain why male baboons have evolved to be larger than the females of the species.

If there is gene flow between two adjacent populations of the same species,then the two populations will

Gene mutation occurs at any time,without respect to the mutation's adaptive value or benefit to the organism.

A random alteration in the sequence of DNA nucleotides that provides a new variant allele is known as a

Which of the following is true about genetic drift?

Mutations that result in resistance to specific antibiotics in bacterial organisms occur

What is the term used to describe the changes in allele frequencies of a population over generations?

Which of the following conditions is not necessary to maintain the Hardy-Weinberg equilibrium?

Over the course of millions of years various environments have changed.As grasslands slowly took the place of forests the inhabitants were forced to adapt or they went extinct.During this time period the horse gradually evolved from a small cat sized creature to the size of the modern horses we see today.This is an example of which type of natural selection?

A population of organisms that reproduce asexually will display more variation than a population that reproduces sexually.

A population was surveyed to determine the percentage of individuals with detached earlobes and attached earlobes.16% of the population was found to have attached earlobes,a trait coded for by a recessive allele.Calculate the allele,genotype and phenotype frequencies of the population,assuming Hardy-Weinberg equilibrium is maintained.

A dominant allele is found in a population with a frequency of 0.8.As the environment begins to change,the dominant allele is not favored.Scientists find that the frequency of the dominant allele decreases by half each generation.What are the allele,genotype,and phenotype frequencies before and one generation after the population begins to change? Is Hardy-Weinberg equilibrium maintained?