Question

1) What will happen to the effective population size if we change the sex ratio from 50% to 90% female? Genetic drift will increase because

(A)The effective population size will increase

(B) The effective population size stay the same

(C) The effective population size will decrease

(D) The effective population size is unpredictable

2) Which stochastic factor(s) was resulting in the prairie chicken population in Illinois heading towards extinction before the translocation of more birds from outside the state?

A. Demographic stochasticity.

B. Genetic drift (and likely) inbreeding.

C. Environmental stochasticity

D. All of the above.

E. None of the above

3) Which of the following increases the probability that the cartoon prey in a southern population would adapt to the invading predator by evolving longer legs?

A. High heritability of leg length.

B. Large positive selection differential for leg length.

C. Low migration rates between invaded and uninvaded comic prey populations.

D. All of the above.

E. None of the above

Answer 1

1. Option c is correct answer.

well-known consequence of skewedsex ratio is a reduction of effective population size, Ne [16], which in turn reduces the effectiveness of natural selection, and leads to higher rates of genetic drift, inbreeding and loss of genetic variability.

What will happen to the effective population size if we change the sex ratio from 50% to 90% female? Genetic drift will increase because

The effective population size will decrease

2. Option b is correct answer

Genetic drift (and likely) inbreeding

What caused the drastic decline of the Illinois greater prairie chicken population?

-decrease in population; DNA from feathers showed that genetic variation had declined; began to translocate them in an attempt to increase genetic variation
-After translocation, the viability of eggs increased & the population rebounded.

3. Option b is correct answer

Which of the following increases the probability that the cartoon prey in a southern population would adapt to the invading predator by evolving longer legs

Large positive selection differential for leg length.