Question 1 A population of salamanders struggles to survive one summer of drought in their normallydamp woodland habitat.Within a few days many of...
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Question 1

A population of salamanders struggles to survive one summer of drought in their normally damp woodland habitat.   Within a few days many of the salamanders develop thick dry skin that protects them from desiccation (drying out).    All offspring and of  these salamanders have dry leathery skin.  This is an example of:

Select one:

a. natural selection

b.  Lamarkism

c. secondary sucession

d. genetic drift


Question 2

Only mutations that occur in _______ remain in the gene pool.

Select one:

a. somatic cells

b. sterile populations

c. unstable populations

d. eggs and sperm


Question 3

The best and most convincing scientific proof that two species are close evolutionary relatives is that:

Select one:

a. their embryos follow the same developmental stages

b. they evolved in similar habitats

c. they share a number of analogous structures

d. nucleotide sequences from their DNA closely match


Question 4

Despite the fact that human toes/fingers appear quite different from horse's hooves, both structures possess the same bones and bone structure.  In humans, natural selection favored separated, elongated dexterous fingers tipped with individual protective nails.  In the horse, selection pressures favored a strong, blunt, fused hoof covered with a single protective nail.   This is an example of :

Select one:

a. analogous evolution

b. homologous evolution

c. convergent evolution

d. founders effect


Question 5

The fossil evidence indicates that the opossum has shown no significant genetic change in the past several hundred thousand years,  suggesting that the opossum species:

Select one:

a. has very little genetic diversity

b. is very close to genetic equilibrium

c. is poorly represented in the geological record

d. is on the verge of becoming extinct


Question 6

If an organ or structure is no longer useful it will regress and be minimally expressed in the gene pool.   Such structures are said to be:

Select one:

a.  homologous

b. analogous

c. vestigial

d. analogous


Question 7

A remote island is populated by one species of iguana, all the direct descendants of  a single pregnant female washed ashore on drift wood after a hurricane.   Which of the following best describes this island population?

Select one:

a. species diversity is higher in the island community than in the mainland community

b. genetic bottleneck results in a decline in species diversity in the island community

c. no genetic drift occurs in the island community

d. the island population will quickly reach a state of genetic equilibrium


(Please explain why you chose the answer)

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