question_answer

In Mendels experiments with garden pea, round seed shape (RR) was dominant over wrikled seed (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the \[{{F}_{2}}-\]generation of the cross \[RRYY\times rryy\]?

A)  Only wrinkled seeds with green cotyledons

B)  Only wrinkled seeds with yellow cotyledons

C)  Only round seeds with green cotyledons

D)  Round seeds with yellow cotyledons, round seeds with green cotyledons, wrinkled seeds with yellow cotyledons and wrinkled seeds with green cotyledons

Correct Answer: D

Solution :

 Yellow round seeds\[\times \]Green wrinkled seeds

YR	YR	Yr	yR	Yr
	YYRR (Round yellow)	YYRr (Round yellow)	YyRR (Round yellow)	Yy Ry (Round yellow)
Yr	YYRr (yellow)	YYrr (Wrinkeld yellow)	YyRy (Round yellow)	Yyrr (Wrinkeld yellow)
yR	YyRR (Round yellow)	YyRR (Round yellow)	yyRr (Round green)	yyRr (Round green)
Yr	YyRr (Round yellow)	Yyrr (Wrinkeld yellow)	yyRr (Round green)	yyrr (Wrinkeld green)

9-Round seed with yellow cotyledons 3-Round seed with green cotyledons 3-Wrinkled seeds with yellow cotyledons 1-Wrinkled seed with green cotyledon