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    How to calculate gene / allele frequency & relative fitness

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    1. A population of gerbils has three color morphs, color is determined by a single locus.

    BB is BLACK, Bb is BROWN, bb is yellow.
    Black has a 25% chance of surviving to adulthood, and has 10 offspring as an adult
    Brown has a 50% chance of surviving to adulthood, and has 5 offspring as an adult
    Yellow has a 25% chance of surviving to adulthood, and has 5 offspring as an adult
    What are the relative fitnesses of each genotype?
    If the initial frequency of the B allele is .75, what is the frequency of that allele after one generation?

    © BrainMass Inc. brainmass.com October 9, 2019, 5:54 pm ad1c9bdddf
    https://brainmass.com/biology/genetic-recombination/how-to-calculate-gene-allele-frequency-relative-fitness-71743

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    Since, Black has a 25% chance of surviving to adulthood, and has 10 offspring as an adult
    Hence, Black has a 100% chance of surviving to adulthood, and has 10 * 100/ 25 = 40 offspring as an adult
    Similarly, Brown has a 100% ...

    Solution Summary

    In Hardy-Weinberg population, allelic frequency can be calculated if the initial frequency of the gene is known. Similarly relative fitness of allelic constitution can be known provided number of surviving allel in a population is known.

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