Principles of Inheritance and Variation Question 42
42. Two genes $R$ and $Y$ are located very close on the chromosomal linkage map of maize plant. When RRYY and rryy genotypes are hybridized, the $F_2$ segregation will show
[2007]
(a) segregation in the expected $9: 3: 3: 1$ ratio
(b) segregation in $3: 1$ ratio
(c) higher number of the parental types
(d) higher number of the recombinant types.
Show Answer
Answer : c
Hints & Solution
(c) When the linked genes are situated quite close, the chances of crossing over are highly reduced. Due to this, large number of parental gametes are formed and only few recombinant gametes are formed. This results in higher number of parental types in $F_2$ generation as compared to recombinants.
