Fruit flies having one allele for curly wings (Cy) and one allele for normal wings (Cy+) develp curly wings.  Fruit flies homozygous for normal wings (Cy+) develop normal wings. When two curly-winged flies were crossed, 204 curly-winged and 98 normal-winged flies.  In fact, all crosses between curly-winged flies produce nearly the same curly-winged to normal-winged ratio.  How would you explain these results?   The Cy allele is epistatic to the Cy+ allele. The Cy+ allelle shows partial dominance over the Cy allele. The Cy allele is dominant for the curly phenotype and is lethal when homozygous.  The Cy+ allele is dominant over the Cy allele and is lethal when homozygous.    The Cy+ and Cy alles are co-dominant.

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Inheritance and Mendelian Genetics

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