Assume that “+” is a dominant functional allele required to make pea seeds round, and “w”...

Assume that “+” is a dominant functional allele required to make pea seeds round, and “w” is a recessive allele that makes pea seeds wrinkled. What are the ratios of the genotypes and the phenotypes of the F1 progeny from the following crosses:

(A) +/+ X w/w

(B) +/w X w/w

(D) w/w X w/w

Solutions

Expert Solution

+ is the dominant allele and w is the recessive allele

So wherever, + is present, it will express regardless of presence of the other allele. The crossovers are drawn in the image below. And the ratios (round:wrinkled) are mentioned under

A. Phenotype: all peas will be round, Genotype: +w

B. Phenotype: 1:1, Genotype: 1:1

C. Phenotype: 3:1, Genotype: 3:1

D. Phenotype: all wrinkled. Genotype: ww

gladiator answered 2 years ago

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