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 ?

Question

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 ? (A) 1600 (B) 800 (C) 400 (D) 1200

Tardigrade Admin · Accepted Answer

Since this pea plant is heterozygous for round shape, its genotype would be Rr.
Parents: Rr

\times

Rr

↓

(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)

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 ?

1600

800

400

1200