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When ppQQrr is crossed with PpQqRR then the ratio of hybrid for all the genes is:

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answer is A.

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Detailed Solution

ppQQrr x PpQqRR

Applying product rule:

pp x Pp

	p	p
P	Pp	Pp
p	pp	pp

Probability of hybrid (Pp)= 1/2

QQ x Qq

	Q	q
Q	QQ	Qq
Q	QQ	Qq

Probability of hybrid (Qq)=1/2

rr x RR

	r	r
R	Rr	Rr
R	Rr	Rr

Probability of hybrid (Rr)= 1

Therefore, ratio of hybrid for all the three genes is= ½ (Pp) x ½ (Qq) x 1(Rr)

= ¼ PpQqRr

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