In a population of 1000 birds, 360 have blue tail feathers while 640 have green tail feathers. Tail color in this population is controlled by two alleles, a blue and a green allele. Birds with two green alleles or one green and one blue allele have green tails. What is the allele frequency of the blue allele?

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neharitupandey2378Lv3

7 Feb 2023

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Consider a hypothetical fish whose scale color is controlled byone gene with two alleles. The gene is inherited in an incompletedominance pattern. In a wild population of 1000 of these fish,there are 625 with blue scales and genotypeS^BS^B, 175 with green scales andgenotype S^BS^Y, and 200 with yellowscales and genotype S^YS^Y.

1. What is the allele frequency of the S^Bgene and the S^Y gene?

2. What is the genotype frequencyobserved in this population for bluefish, for green fish, and for yellow fish?

3. What is the genotype frequencyexpected if the population follows HardyWeinburg equilibrium for the blue, the green, and the yellowfish.

4. Explain why this fish population is, or is not in HardyWeinburg equilibrium. If it is not in Hardy Weinburg equilibrium,what type of selection is likely occurring?

brownsheep453

In the parakeet, two unlinked autosomal gene loci produce feather pigment. Allele B at one locus produces a blue pigment. Allele Y at the other locus produces a yellow pigment. Recessive, loss-of-function alleles exist at each locus which prevent their respective pigments from forming properly. Two green parakeets are mated and produce green, blue, yellow and white progeny. Based on this information, explain the inheritance of feather coloration in these parakeets including:

a. the parental genotypes

b. the general genotypic formulae for green, blue, yellow, and white parakeets

c. the expected phenotypic ratio of offspring from this type of parental cross.

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?