A large population of laboratory animals has

Question

been bred randomly for a number of generations.
There was an interesting revelation.
The scientists noted that there was neither
an increase nor a decrease in the frequency
of animals displaying the recessive trait ‘aa’;
i.e., it remained at 60% during several generations.
The remaining animals were dominant
homozygotes and heterozygotes for the dominant
phenotype.
What conclusion would you draw, if no
change in the frequency of the recessive trait
(aa) is observed over a period of time involving
several generations?
1. There has been sexual selection favoring
allele a.
2. The two phenotypes are about equally
adaptive under laboratory conditions. (correct answer)
3. There has been a high rate of mutation of
allele A to allele a.
4. The genotype is lethal.
5. The population is undergoing genetic
drift.
044 (part 2 of 3) 5.0 points
What would be the estimated frequency of
allele ‘a’ in the gene pool?
045 (part 3 of 3) 5.0 points
What would be the frequency of the dominant
heterozygotes (Aa) for this trait?
don't understand how to get answers for parts two and three.

Answer 1

The population is in equilibrium, so the frequency of the recessive genotype aa, 0.6, taking the square root to get the frequency of the allele (.775)

frequency of the dominant Aa then would be you need to work it yourself, see this sample:
http://www.k-state.edu/parasitology/biology198/answers1.html

Answer 2

ggbyty