Question

In garden pea ,yellow colour of cotyledons is dominant over green and round shape of seed is dominant over wrinkled.When a plant of yellow and round seeds is crossed with a plant having yellow and wrinkled seeds ,the progeny showed segregation for all the four charecters.The probability of obtaining green round seeds in the progeny of the cross is

• A. $\frac{1}{4}$
• B. $\frac{1}{8}$
• C. $\frac{1}{16}$
• D. $\frac{3}{16}$

Answer 1

Answer: (D)

$\frac{3}{16}$

YY$\to$ Yellow colour cotyledon; RR- Round shape

yy$\to$ green colour cotyledon; rr-wrinkled shape

RRYy$\times$rrYy

RY Ry rY ry

RY RRYY RRYy RrYY RrYy

Ry RRyY RRyy RrYy Rryy

rY RrYY RrYy rrYY rrYy

ry RrYy Rryy rrYy rryy

$\Rightarrow$ Total no. of progenies

$\Rightarrow 16$

The genotypes are as followed:-

RRyy

Rryy

Rryy

i.e., $\frac{3}{16}$.