mini test 2 questions

Question 1

The molecular clock hypothesis implies that:

Answer 1

the rate of amino-acid substitution in a particular gene is constant over evolutionary time

Question 2

In the lakes of East Africa more than 1500 species of related cichild fish have evolved over the last 10 million years. These lakes are subject to periodic severe droughts that subdivide the large lakes into more numerous smaller lakes. What mode of speciation is likely to have resulted in this remarkable diversity of species

Answer 2

Allopatric speciation

Question 3

Sympatric speciation that involves a hybrid between two related species is known as

Answer 3

allopolyploidy

Question 4

Hybrid infertility is an example of

Answer 4

a postzygotic reproductive barrier

Question 5

Which is NOT an example of a reproductive isolating mechanism

Answer 5

hybrid zones

Question 6

What would happen if all animals were herbivores

Answer 6

A mutation that led to predatory behaviour would be extremely successful

Question 7

Competition

Answer 7

occurs within and between species

Question 8

Genetic drift leads to:

Answer 8

a loss of genetic variation within a population

Question 9

If the relative fitness of genotypes MM, MN, and NN are 0.8, 1.0, and 0.2 respectively, what do you expect to happen to the frequency of the N allele?

Answer 9

It will be maintained in the population because the heterozygote has the highest fitness

Question 10

Inbreeding leads to:

Answer 10

an increase in the frequency of homozygotes in the population

Question 11

euploidy

Answer 11

change in an entire set of chromosomes

Question 12

allopolyploidy

Answer 12

arrives from two or more diverged taxa

Question 13

autopolyploidy

Answer 13

single parental taxa