First slide

Inheritance of Two Genes

Question

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

Easy

A

¼
B

1/8
C

1/16
D

1/32

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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