Principles of Inheritance and Variation Question 96
96. In a cross between $AABB \times$ aabb, the ratio of $F_2$ genotypes between AABB, AaBB, Aabb and aabb would be
[1992]
(a) $9: 3: 3: 1$
(b) $2: 1: 1: 2$
(c) $1: 2: 2: 1$
(d) $7: 5: 3: 1$
Show Answer
Answer : c
Hints & Solution
(c) Genotype is the genetic make up of an individual irrespective of the Mendelian characters or genes impressing.
| $AB$ | $Ab$ | $aB$ | $ab$ | |
|---|---|---|---|---|
| $AB$ | $AABB$ | $AABb$ | $AaBB$ | $AaBb$ |
| $Ab$ | $AABb$ | $AAbb$ | $AaBb$ | $Aabb$ |
| $aB$ | $AaBB$ | $AaBb$ | $aaBB$ | $aaBb$ |
| $ab$ | $AaBb$ | $Aabb$ | $aaBb$ | $aabb$ |
