Biology 101 questions ANSWER check/help please?

[krnkinka]

Hi all. These are questions from biology 101 class. This chapter is pretty tough and hardly can find any answers. Please take your time and help. I did manage to answer couple, and there are ones I couldn’t answer at all. You don’t have to answer all. But please answer on ones you know for sure and only. Thank you all so much in advance!

1) Which of the following is a source of new alleles within a population?
a.genetic recombination
b.meiosis
c.mutation
d.genetic drift
e.natural selection

2) The black-bellied seedcrackers of Cameroon
a.have bills either 12 or 15 mm wide.
b.prefer soft seeds.
c.sustain intense competition for scarce seeds during times of drought.
d.provide an example of disruptive selection.
e.all of these

3) Sexual dimorphism has arisen as a result of
a.stabilizing selection.
b.heterozygote superiority.
c.kin selection.
d.sexual selection.
e.directional selection.

4) Genetic drift
a.leads to a loss of diversity in a population.
b.requires small populations.
c.occurs in populations with the founder effect.
d.occurs following a bottleneck.
e.all of these

5) Island populations do NOT exhibit which of the following when compared to the mainland populations from which they are derived?
a.greater variability
b.greater extinction rates
c.fewer heterozygous loci
d.large chance fluctuations in allele frequencies
e.less genetic drift

Matching

For the following statements select the best choice of the four evolutionary processes listed.
a.mutation
b.gene flow
c.genetic drift
d.natural selection


____C26.This is most likely to lead to the loss of genetic variation in a small population.

____27.This process produces new genetic variation within a species.

____28.This process can rapidly offset the effects of genetic isolation when two populations come into secondary contact.

____D29.The reduced contribution of one phenotype in comparison to another to the next generation is an example of this.

____30.The occurrence of mimicry is best explained as the ultimate result of this process.