You have discovered that a single co-dominant gene controls the date when monarc

Question

You have discovered that a single co-dominant gene controls the date when monarch butterflies break diapause (=become reproductively active) in Mexico. You were extremely busy this spring, and extensively sampled one overwintering site to find that 1600 monarchs broke diapause in early February, 400 broke diapause in late February, and 700 broke diapause in early March. You know there are two alleles at this locus, and that heterozygotes break diapause in late February. Showing your work, answer the following questions:

a. What is the observed frequency of the allele coding for early emergence?

b. Does this gene appear to be in Hardy-Weinberg equilibrium in this population?

Explanation / Answer

monarch 1600= early feb(MM)- alleles: 3200,

400= late feb,(Mm)= total allele 800,so 400 early feb, and 400 early march as codominant

700 early march(mm), 1400 alleles, total num of alleles 5400; 3600/5400=0.66(p)= early feb obs frequency;1800/5400=0.33(q)=early=obs freq of allele in early march.

to see H.W law, p^2+2pq+q^2=1; ..0.4356+.4356+.1089= 1, hence proved population is in H.W equilibrium

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