Ch. 18 Evolution of Pop Review

The genes carried by all members of a particular population make up the population's

• Allele Frequency

• phenotype

• genotype

• gene pool

In a fox population, the allele frequency of a gene for red fur changes from 20% to 30%. What can you say about that population of foxes.

• The population is expanding

• The population is evolving

• The population is decreasing

• The population is not evolving

A change in the genetic material of a cell is called a

• recombination

• polygenic trait

• single-gene trait

• mutation

Genetic recombination includes the independent movemnet of chromosomes during meiosis as well as

• mutations from radiation

• changes in the allele frequencies

• crossing-over

• mutations from chemicals

A single-gene trait that has two alleles and that shows a simple dominant-recessive pattern will result in

• one phenotype

• two phenotypes

• four phenotypes

• millions of phenotypes

If a mutation introduces a new skin color in a lizard population, which factor might determine whether the frequency of the new allele will increase

• how many other alleles are present

• whether the mutation makes some lizards more fit for their environment than other lizards

• how many phenotypes the population has

• whether the mutation was caused by nature or by human intervention

In genetic drift, the allele, frequencies in a gene pool change because of

• mutations

• chance

• natural selection

• genetic equillibrium

The type of genetic drift that follows the colonization of a new habitat by a small group of individuals is called

• the Hardy-Weinberg principle

• the founder effect

• directional selection

• stabilizing selection

the allele frequencies of a population are more likely to change if

• the population size is increased

• no immigration or emigration occurs

• mating is not random

• the mutation rate decreases

The separation of populations by barriers such as rivers, mountains, or bodies of water is called

• temporal isolations

• geographic isolations

• behavioral isolation

• genetic equillibrium