The figure below is from Ferrari et al. (2014, Apidologie) and shows integument

Question

The figure below is from Ferrari et al. (2014, Apidologie) and shows integument (outer layer) color variation in the orchid bee Euglossa iopoecila at four sample sites (A-D) Green morph Blue morph 1. Suppose integument color is controlled by one locus with two alleles. Which sample site(s) are polymorphic and which are fixed for alleles causing color variation? (1 pts) a. b. Are the alleles interacting in a dominant/recessive or codominant way? (1 pt) Suppose we sample population B and we find 240 bees that are green, 170 that are blue, and 40 that are aquamarine 2. a. What are the allele frequencies at the color locus in the population? (2 pts) b. If this population randomly mates for one generation, what will be the genotypic frequencies? (2 pts)

Explanation / Answer

Ans.

1. a)

Sample site B is polymorphic as it has 3 variants -

Green, intermediate and blue.

C is not polymorphic as it has 2 variants only.

A and D are fixed for blue and green alleles respectively.

b)

alleles are codominat as we have 3 phenotypes resulting from one locus with two alleles.

if one allele was dominant over the other than there could only be two phenotypes i.e., green and blue.

2-

a) IGIG - 240

IBIB - 170

IGIB - 40   

Allele frequency (IG) = 240*2 + 40 / 2*(240+170+40) = 0.58

Allele frequency (IB) = 170*2 + 40 / 2*(240+170+40) = 0.42

b) genotypic frequencies =

IGIG = 0.58 * 0.58 = 0.336

IBIB = 0.42 * 0.42 = 0.1764

IGIB = 2 * 0.58 * 0.42 = 0.4872

c) The allele frequencies would remain the same after 1000 generations if the population is randomly mating and there is no natural selection.

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