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  4. In garden pea, round shape of seeds is dominant over wrinkled shape. A pea plant heterozygous for round shape of seed is selfed and 1600 seeds produced during the cross are subsequently germinated. How many seedlings would have the parental phenotype ?

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Q. In garden pea, round shape of seeds is dominant over wrinkled shape. A pea plant heterozygous for round shape of seed is selfed and 1600 seeds produced during the cross are subsequently germinated. How many seedlings would have the parental phenotype ?

KCETKCET 2014Principles of Inheritance and Variation

Solution:

Since this pea plant is heterozygous for round shape, its genotype would be Rr.
Parents: Rr $\times$ Rr
$ \,\,\,\,\,\,\,\,\,\downarrow$ (selfing)
Progeny: RR Rr Rr rr
Phenotypically, the ratio will be 3 : 1 i.e., only rr seedlings will show wrinkled phenotype, rest will show round shape.
1200 $\to$ Round shape (RR, Rr)
400 $\to$ Wrinkled (rr)