Principles of Inheritance and Variation Question 13
13. A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the $F_1$ plants were selfed the resulting genotypes were in the ratio of
[2016]
(a) $1: 2: 1::$ Tall homozygous : Tall heterozygous : Dwarf
(b) $1: 2: 1::$ Tall heterozygous : Tall homozygous : Dwarf
(c) $3: 1::$ Tall : Dwarf
(d) $3: 1::$ Dwarf : Tall
Show Answer
Answer : a
Hints & Solution
(a) Parents-TT $\times$ tt $F_1$ generation $Tt$ (Heterozygous Tall) On Selfing
| $T$ | $t$ | |
|---|---|---|
| $T$ | $TT$ | $Tt$ |
| Tall | Tall | |
| $t$ | $Tt$ Tall |
$tt$ Dwarf |
| Phenotypic ratio : 3: 1 (Tall :Dwarf) | ||
| Genotypic ratio: 1:2:1 (Homozygous Tall : Heterozygous Tall : Dwarf) |
