BIO Homework Chapter 12

Select the answers that correctly pair the person with his idea, AND that support Darwin's hypotheses about the diversity of life. (Select all that apply.)

-Malthus' ideas on limited resources -Wallace's natural selection

Click on the examples that might be evidence of sexual selection. (Select all that apply.)

-Two male deer battling with their antlers -Female seal choosing a mate with the largest territory -Bird displaying feathers to females

How does natural selection operate? (Select all that apply.)

-Individuals with adaptations to their environment pass on their genes to more offspring -Natural selection acts on genetic variation of organisms into population

The natural selection image in the concept map above indicates that moths with the darkest coloration have the greatest reproductive success when trees in the habitat are dark. What type of natural selection does this image depict?

Directional selection

Resistant bacteria are more likely to survive a dose of antibiotics, and are therefore more likely to reproduce. The resistance allele will be more common in the next generation.

Evolutionary theory supports this statement

True or false: A selective force (such as antibiotics) must be present for DNA mutations to occur.

False

In what situation might natural selection maintain a recessive allele even if it is harmful?

Individuals that are heterozygous for a gene have a higher survival and reproductive rate than individuals that are homozygous for the gene.

Imagine that individuals with a certain allele (B) have much greater reproductive success than those without the allele. However, individuals with the B allele also have shorter life spans than those without the allele. How would you predict the allele frequencies in the population will change through subsequent generations?

The B allele will become more common only if the individuals reach reproductive ages.

A tadpole evolves legs so it can leave the water. The tadpole passes on the leg trait to the next generation.

This statement conflicts with evolutionary theory

True or false: Genetic drift and migration are mechanisms of evolution but are not mechanisms of natural selection.

True

An earthquake causes the size of a deer population to drop rapidly over a short period. Allele frequencies shift. What mechanism of evolution does this situation illustrate?

genetic drift - bottleneck effect

Natural selection requires genetic variation, competition for limited resources, overproduction of offspring, and unequal reproductive success. The subset of finches that is capable of eating large seeds, while many others eat small seeds, is an example of which requirement?

genetic variation

Cheetahs that run the fastest are most likely to catch prey and survive to reproduction. Fast cheetahs become more common in the population.

Evolutionary theory supports this statement.

Predators on the ground threaten a male reptile, so it evolves wings to escape predation. It passes on the wing trait to the next generation, shifting the allele frequency in the population.

This statement conflicts with evolutionary theory