Question

The Punnett square shown below represents the pattern of inheritance in the dihybrid cross where yellow seed colour (Y) is dominant over green (y) and round (R) is dominant over wrinkled seeds (r).

	YR	Yr	yR	yr
YR	F	J	N	R
Yr	G	K	O	S
yR	H	L	P	T
yr	I	M	Q	U

A plant of ‘H’ type will produce seeds with the genotype identical to seeds produced by the plants of __________.

• A. type J
• B. type N
• C. type M
• D. type P

Answer 1

The correct option is B type N

Given that, Y is dominant for yellow seed colour and y is the contrasting recessive trait of it; similarly round seed shape (R) is dominant and wrinkled (r) is its contrasting recessive trait.
Plant 'H' is formed by the fusion of gametes yR and YR and hence its genotype would be YyRR. Among all the other offspring, plant N also possess the same genotype.
So identical seeds are produced by plants H and plant N because both plants type have the same genotype (YyRR)