Reference no: EM133264106

Assignment:

Q 1. Just wondering why Sexual reproduction can speed the spread of adaptations in a population.

1. Both 3 and 4 are correct.

2. Statement 2. Sexually transmitted diseases reduce fitness of individuals.

3. Statement 4. Beneficial mutations can be combined and harmful mutations can be purged.

4. Both 1 and 2 are correct.

5. Statement 3. Recombination can lead to novel genotypes.

6. Statement 1. Males and females must travel to locate each other, thereby spreading their genes more broadly

Q 2. The Red Queen effect refers to the fact that,

1-Parasites often kill their hosts, and therefore act as potent agents of selection on host populations.

2. Social insect colonies often have reproductive queens who actively suppress the reproductive capacity of worker females in the colony.

3. All of the above.

4. None of the above.

5. Parasites evolve faster than their hosts.

6. Host immune systems evolve continuously and quickly in an arms race with parasite populations that are also evolving to evade their defenses.

Q 3. So Which process led to the evolution of snake venom?

1. Gene recruitment.

2. All of the above.

3. Gene duplication.

4. None of the above.

5. Natural selection.

Q 4. Just wondering which of these is a TRUE statement about molecular clocks.

1. Molecular clocks can be affected by the segments of DNA being examined and relative sizes of the populations.

2. Molecular clocks can be calibrated using fossils of known age.

3. All of the above are true.

4. None of the above are true.

5. Molecular clocks use neutral theory to date events within a phylogeny.

Q 5. So why don't all gene trees reflect the phylogeny of species?

1. Both statements 2 and 3.

2. Statement 3. Because speciation events can sometimes be very rapid.

3. All of the above.

4. Statement 2. Because coalescence of specific genes can occur before speciation events.

5. Statement 1. Because the branch lengths of a species tree are usually much longer on average than the coalescence times of the genes being analyzed.

Q 6. Just wondering, how does a selective sweep for an allele at one locus affect variation at adjacent loci?

1. Selective sweeps do not affect flanking loci.

2. Variation in flanking loci is reduced.

3. Higher levels of recombination occur.

4. Flanking loci are eliminated completely.