Set up the following Drosophila melanogaster crosses (P to F1 only) using Punnet

Question

Set up the following Drosophila melanogaster crosses (P to F1 only) using Punnett squares and complete lableling. All genotypes must be designated with appropriate upper or lower case letter, with or without .Use true-breeding parents for the crosses unless described otherwise. Describe/list phenotypic ratios of F1 offspring 1a, X-linked trait: vermillion v, bright red eyes P cross: vermillion-eyed male X normal-eyed female 1b. X-linked trait: vermillion v, bright red eyes P cross:reciprocal cross of "a " above

Explanation / Answer

X linked vermillion bright red female x normal eyed male vermillion can be denoted with V If females are vermillion XVXV and males are normal.........X+y 50% offspring are normal and 50% are vermillion All females (100%) are normal and all males (100%) are vermillion XV XV X+ XVX+ (normal) XVX+ (normal) y XVy (vermillion) XVy (vermillion) X linked vermillion bright red male x normal eyed female If males are vermillion XVyand females are normal.........X+X+ 100% offspring are normal All females and males (100%) are normal X+ X+ XV X+XV X+XV y X+y X+y

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