Species 1 has a population that is rather small (8 individuals). In this populat

Question

Species 1 has a population that is rather small (8 individuals). In this population there are only 2 individuals that are ‘Aa’ and 6 are ‘AA’. Suppose further, that by chance, the 2 ‘Aa’ don’t mate with each other and instead they each mate, only one time each, with an AA individual. [O.K. this is really a continuation of #1 above] Let's next, suppose that the 2 separate AaxAA crosses produced only AA offspring and the parents died after this single mating. Also, the AA parents mated once to each other and died after the mating. Thus, the ‘a’ allele is lost this population. The loss of the ‘a’ allele, under these circumstances, in this population and the subsequent population having only A, has come about because of :
[i.e. what term below best describes a mechanism whereby the population is now 'fixed' at dominant alllele ('A') for the A trait.]

a synopsis for this problem:
Aa x AA = 1 offspring that is AA;
Aa x AA = 1 offspring that is AA;
all others are AA x AA = all AA offspring


A. gene flow

B. genetic drift

C. frequency dependent selection

D. inbreeding

E. assortative mating

F. directional selection

G. stabilizing selection

H. disruptive (diversifying) selection

I. kin selection

J. sexual selection

Explanation / Answer

A. gene flow no, that's genes in and our of a poplulations

B. genetic drift this occured by chance, which is why it's drift.

C. frequency dependent selection

D. inbreeding

E. assortative mating no, just no. definitely not.

F. directional selection no, this favors one extreme or another

G. stabilizing selection no, this favors intermediates

H. disruptive (diversifying) selection no, this favors two different extremes

I. kin selection another not even close option

J. sexual selection no--they mention nothing about cool looking traits

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