The "F" ears represent another type of locus interaction in a dihybrid cross (different from that...

The "F" ears represent another type of locus interaction in a dihybrid cross (different from that in #5). At one locus the dominant allele (D) would normally produce a purple seed. However, the dominant allele (I) at a second, unlinked locus inhibits formation of purple pigment, and a yellow seed is the result just as though the seed were homozygous recessive at the first locus. Allele "i" does not block pigment formation, and the recessive "d" allele produces a yellow seed when it is expressed. (Here the absence of purple pigment results in a yellow seed.) In this particular cross both parents were doubly heterozygous. A count of progeny on one ear was 117 purple and 475 yellow.

a. Can you determine easily what phenotype ratio this approximates?
b. Do the Punnett square analysis to determine the expected phenotype distribution. Is the observed distribution close to the expected distribution?
c. What do we call this type of interaction of loci?

Expert Solution

gladiator answered 2 years ago

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