The figure above shows the effect of two genotypes on growth rate. The two loci

Question

The figure above shows the effect of two genotypes on growth rate. The two loci assort independently (they are not linked). If you cross (mate) two N/n S/F individuals (I.e. they are heterozygotes at both loci), and impose strong selection on the offspring so that only the fastest growing individuals survived, what is the effect of the selection on the variation at the two loci. * A)Variation for both loci decreases B)Variation for the Nn loci stays the same and variation for the SF loci decreases C)Variation for the SF loci stays the same and variation for the Nn loci decreases D)Variation for the Nn loci stays the same and variation for the SF loci increases E)Variation for both loci increases Growth rate NN Nn nn Growth rate SS SF FF

Explanation / Answer

Ans is C.

The distribution of the growth rate is relatively homogenous for the SF loci. Hence during selection the variation would remain much the same. While the distribution of growth rate for Nn loci is very heterogenous and spread out. It shows that individuals with both fast and slow growth rates possess the Nn loci. As selection would allow only ones with fastest grwoth rate to survive, the variation a Nn loci would decrease.

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