You are a researcher who is interested in three genes in drosophila: The a gene, the...

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Biology

You are a researcher who is interested in three genes indrosophila: The a gene, the b gene and the c gene. You think thegenes may be linked, so you decide to do a cross using atrue-breeding a+/b+/c+ fly and an a/b/c fly. The F1 generation isall a+/b+/c+. However, when the F1 generation is bred to atrue-breeding a/b/c fly, it yields the following offspringphenotypes: 589 a+/b+/c+ ; 603 a/b/c ; 183 a+/b/c ; 176 a/b+/c+ ;92 a/b+/c ; 95 a+/b/c+ ; 4 a+/b+/c ; 6 a/b/c+. Is this the expectedratio for unlinked genes (hint: the critical chi-squared value is7.815)?

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The parental plants are truebreeding and hence are homozygousall three lociHence one parent is abcabc The other parent is a b ca bcThe cross of these will give all individuals in F1 of thegenotype abca b c Phenotypically these will be abcNow these F1 individuals are crossed with truebreeding a b cfliesThe gametes produced by a b c flies will only be a b and cNow if See Answer

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