Question

Consider the following 3 populations of butterflies. Assume HW equilibrium. With these butterflies brown spots on the wings is recessive, while black spots on wings is dominant.
Population 1 has 50 butterflies, of which 5 are brown-spotted and 45 are black-spotted
Population 2 has 500 butterflies of which 125 are brown-spotted and 375 are black-spotted
Population 3 has 1.250 butterflies, of which 313 are brown-spotted and 937 are black-spotted.
Which population is least susceptible to an alteration of allele frequencies due to an accident?
a. insufficient information
b. they are all the same
c. population 2 and 3
d. population 1
e. population 2
f. population 3
Which population is most likely to be subject to a bottleneck effect?
a. population 3
b. population 2 and 3
c. population 1
d. they are all the same
e. insufficient information
f. population 2
Which population has the highest frequency for the brown allele?
a. population 1
b. population 2 and 3
c. they are all the same
d. insufficient information
e. population 2
f. population 3

Answer 1

Answer:

Population 3

As there are more number of individuals in this population , allele frequency is least likely to alter because of accident which may involve not many butterflies.

Population 1

Bottle neck effect causes more losses due to genetic drifts on small populations. So population 1 with 50 butterflies is most susceptible.

Population  3

Population 3 has the highest frequency of the brown allele.

Population 1 = 5/45 = 0.11

Population 2 = 125/500 = 0.2500

Population 3 = 313/1250 = 0.2504

Explanation: