AAC Unit 7 Reteach

In genetic drift, allele frequencies change because of

• mutations

• chnace

• natural selection

• genetic equilibrium

In natural selection, what does the selecting?

• fitness advantages

• phenotype of the individual

• genetic makeup of the individual

• environmental changes

In the past, mass extinctions encouraged the rapid evolution of surviving species -

• by changing the developmental genes.

• by making new habitats available to them.

• because they killed all organisms that had coevolved.

• because they spared all organisms that had evolved convergently.

The study of developmental biology shows that -

• closely related species will show similarities in embryos.

• if species have changed over time, their genes should have changed.

• closely related species will show similarities in amino acid sequences.

• distantly related species will show similarities in anatomy.

Donkeys have variable tail length. In one population of 1000 donkeys, 25% of donkeys have homozygous long tails, 65% of donkeys have homozygous short tails, and 10% of donkeys have heterozygous long tails. Long tails are dominant to short tails. Is this population in Hardy-Weinberg equilibrium and what are the frequencies of the alleles?

• Yes, p = 0.3, q = 0.7

• No, p = 0.3, q = 0.7

• Yes, p = 0.4, q = 0.6

• No, p = 0.6, q = 0.4

Natural selection depend directly on -

• alleles

• genes

• phenotypes

• mutations

The Hardy-Weinberg equation characterizes the genotype frequencies and allele frequencies

• of a population that is experiencing selection for mating success

• of a population that is extremely small

• of a population that is very large and not evolving

• of a community of species that is experiencing selection

Refer to the graph above. Which statement best expresses the principle illustrated by the data shown in the graph?

• The effects of disruptive selection over time is shown in population B.

• Population C was not able to compete as effectively with population A or B.

• Allele frequencies are more likely to remain stable in large populations than in small populations.

• Allele frequencies do not change dramatically whether the population is large, medium, or small.

Why are mutations in body cells not a source of genetic variation?

• They do not affect the phenotype

• They are not passed on to offspring

• They do not produce dominant traits

• They always result in the death of the individual

Charles Darwin called the ability of an organism to survive and reproduce in its specific environment -

• diversity

• fitness

• adaptation

• evolution