Exam 20: Genes Within Populations

Which of the following would be expected to produce the largest evolutionary change in a given period of time in a population of birds?

The Hardy-Weinberg equations only hold true,that is,a population is only in equilibrium

In a large population of randomly reproducing rabbits,a recessive allele r comprises 80% of the alleles for a gene,while a dominant allele R comprises the remaining 20%.What percentage of the rabbits would you expect to have the recessive phenotype?

Although it was a rare trait in the mainland population,one of the original female mice is homozygous for very large ears.This will lead to a population with a higher incidence of big ears than the mainland population because of

The genetic contribution of an individual to succeeding generations,compared with that of other individuals in the population,is known as

Selection cannot alter a trait with little or no genetic variation and will not eliminate _________ alleles.

In some instances environmental change causes a situation where one phenotype is favored for a period of time,and then a different phenotype is favored.This oscillating selection causes

Genotypes are said to be in ___________ equilibrium if there is random mating and no other forces tend to alter the proportions of alleles from one generation to the next.

Sometimes a restriction in genetic variability is imposed on populations by natural catastrophes such as flooding,earthquake,etc.The surviving individuals reflect only a small,random genetic sample of the population affected.This process is termed

In some populations the drive is to mate with individuals that are phenotypically different at a variety of loci.This leads to large numbers of heterozygotes and is called

The recessive phenotype of a trait occurs in 20% of a population.There are no selection pressures affecting this trait.What would be the expected frequency of the dominant allele after six generations of continued non-selection?

Which of the following statements about the laboratory and field studies on evolution of protective coloration in the guppy (as described in the textbook)is false?

The frequency of a particular allele within a population can be changed,over time,by

The fitness of an individual may depend on all of the following factors except

For a gene with two alternative alleles,a (frequency p)and a (frequency q),the term in the algebraic form of the Hardy-Weinberg equilibrium for the heterozygote genotype frequency is

When selection acts to eliminate one extreme from an array of phenotypes it is called

The several hundred species of picture-winged fruit flies of the Hawaiian Islands are genetically very similar,yet they all differ markedly from their ancestral population in Asia.This is probably an example of

"The inheritance of acquired characteristics" proposal was put forward by

Large,colorful,later reproduction is favored.

In order for natural selection to occur within a population,certain conditions must be met.One such condition is