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Many of the color varieties of summer squash are determined by several interacting loci: AA or
Aa gives white, aaBB or aaBb gives yellow, and aabb produces green. Crosses among
heterozygotes give a 12:3:1 ratio. What type of gene interaction would account for these results?
Solution
Answer is Dominant epistasis.... 12:3:1
In this epista allele is Dominant so onely one copy is needed to mask the other gene.

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