A cross is made between a pea plant with round and yellow seeds (RRYy) and a heterozygous parent (RrYy). What will be the phenotypic and genotypic ratios of the offspring?
Text Solution
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Parent 1: RRYy (homozygous Round, heterozygous Yellow)
Parent 2: RrYy (heterozygous Round and Yellow)
Gametes:
Parent 1 (RRYy) can produce:
RY and Ry
Parent 2 (RrYy) can produce:
RY, Ry, rY, and ry
Punnett Square:
RY | Ry | rY | ry | |
RY | RRYY | RRYy | RrYY | RrYy |
Ry | RRyY | RRyy. | RryY | Rryy |
Phenotypic ratio: 3 Round Yellow:
1 Round Green
Genotypic ratio: 1:2:1:1:2:1
(1 RRYY : 2 RRYy : 1 RRyy :
1 RrYY: 2 RrYy: 1 Rryy)
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