Use this information to answer questions 6 - 11. Your original population of
200 was hit by a tidal wave and 100 organisms were killed, leaving 36
homozygous recessive out of the 100 survivors. If we assume that all
individuals were equally likely to be wiped out, how did the tidal wave
affect the predicted frequencies of the alleles in the population? Assume
the new population is at equilibrium after the event, so you are comparing
two populations that are at equilibrium to look for changes in allele
frequencies.
what is the frequency of the recessivr allele

1. How did the tidal wave  affect the predicted frequencies of the alleles in the population?

No changes

2. What is the frequency of the recessive allele?

q= 0.6

Explanation:

If we assume that all individuals were equally likely to be wiped out, that means the frequency/ratio of the gene and genotype of the population will not change. The tidal wave killing 100 out of 200, so it simply makes the population become half of it used to be.  

If the population at equilibrium, we can use the Hardy-Weinberg formula to find out the expected frequency of the dominant and recessive alleles. There are 36 homozygous recessives out of 100, so the frequency of the recessive allele will be:

q^2 = 36/100

q= √36/100= 6/10= 0.6