Please answer all the questions and double check your answers to get a thumbs up. 1) A population of salamanders struggl

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Please answer all the questions and double check your answers to
get a thumbs up.
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:
a. natural selection
b. Lamarkism
c. secondary sucession
d. genetic drift
2) Only mutations that occur in _______ remain in
the gene pool.
a. somatic cells
b. sterile populations
c. unstable populations
d. eggs and sperm
3) The best and most convincing scientific proof
that two species are close evolutionary relatives is
that:
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
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 :
a. analogous evolution
b. homologous evolution
c. convergent evolution
d. founders effect
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:
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
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:
a. homologous
b. analogous c.
vestigial d. analogous
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?
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