Chapter 23 Bio 111 Connect assignment

A student proposes that left-handedness is a recessive trait. A survey of a class of 36 students finds that 27 (0.75) are right-handed and 9 (0.25) are left-handed. If this population is in Hardy-Weinberg equilibrium, what are the genotypic and allele frequencies?

0.25 homozygous dominant, 0.50 heterozygous, and 0.25 homozygous recessive, and a 0.5 allele frequency for each allele

For a gene to be considered polymorphic, it must have at least two alleles that each occur at a frequency greater than

1%

In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of the allele a is 0.4. What is the percentage of the population that is homozygous for this allele?

16

f the Hardy-Weinberg equilibrium is met, what is indicated?

Evolution is not occurring because the alleles in the population remain the same.

Select the conditions that must be met for a population to be in Hardy-Weinberg equilibrium.

Natural selection is not occurring. Mating is random. The population is very large.

What is a SNP?

a change in a single nucleotide pair of DNA

A(n) ______ is a genetic change that makes some individuals in a population better suited to their environment and therefore more likely to survive and reproduce.

adaptation

Some genetic changes make some individuals in a population become better suited to their environment and therefore more likely to survive and reproduce. This phenomenon is termed

adaptation

What is the gene pool composed of?

all of the alleles for every gene in the population

The number of copies of an allele in a population divided by the total number of all alleles for that gene in a population is the

allele frequency.

The allele frequency is calculated by dividing the number of copies of a specific ______ in a population by the ______ for that gene in that population.

allele; total number of all alleles

With respect to fitness, mutations may be

beneficial neutral deleterious

A gene could be polymorphic if it

has at least two alleles in a population.

Changes in the gene pool of a population from generation to generation are called

microevolution

A condition in which a population has more than one variant or trait for a given character is called a(n)

polymorphism

What term refers to the presence of two or more variants for a given character in a population?

polymorphism

___ ___ is the study of genes and genotypes in a population.

population genetics

A polymorphism that changes a single base pair of DNA is called a:

single nucleotide polymorphism

What is population genetics?

the study of genes and genotypes in a population