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5 Mar 2018

1. Suppose you have a solution that is yellow in color, and you measure absorbance and also transmittance at a variety of wavelengths. The wavelength of yellow light is approximately 570 nm. For the yellow solution, would you expect to see peak absorbance, or peak transmittance at 570 nm? Why?

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ivoryhound489

The wavelength sensitivity of opsin genes give animals the ability to see specific colors of light. To have good color vision, an animal needs opsins that are well-spaced, and thus the advantage of an allele at one opsin gene may depend on the specific allele present at another opsin gene. You are therefore interested in the degree of linkage disequilibrium between two alleles of BLOP, a gene that confers the ability to see blue light, and LOPA, a gene that confers the ability to see green light. The alleles of BLOP are maximally sensitive to light at 500 and 515 nm wavelengths, respectively. The alleles of LOPA are maximally sensitive to light at 545 nm and 570 nm. By genotyping sperm produced in your population, you are able to determine that gametes occur in the following frequencies (BLOP/LOPA)

500/545 0.32

500/570 0.21

515/545 0.09

515/570 0.38

Imagine that you are able to determine that the blue opsin is under selection, such that lifetime fitness of individuals with the 500 allele is better than individuals with the 515 allele. However, the green opsin is not under selection.

****Question: How would you figure out how rapidly the green opsin will evolve? What assumptions do you need to make?