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Homework Help: Genetics problem - genotypes and epistasis

  1. Jul 15, 2015 #1
    https://scontent-ord1-1.xx.fbcdn.net/hphotos-xpf1/v/t1.0-9/11695990_871019416316266_5030432296478917772_n.jpg?oh=e6514207eea2317acc509cbb8d1382b0&oe=560E6C72 1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution

    I'm really not sure how to solve this or where to begin. I don't know which genotypes to use (YYyy or RRrr?). The ratios are familiar to me as a result of epistasis, but I don't know how to show the genotypes (a.) or explain how the F1 phenotypes and F2 ratios are produced (b.)

    Could someone show me the process? Thanks!
  2. jcsd
  3. Jul 16, 2015 #2
    You guess genotypes, work all the Punnett squares, and go with the answer whose Punnet squares predict the right phenotype ratios.
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