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4.Principles of Inheritance and Variation
medium
If in a garden pea plant, a cross is made between red flowered and white flowered plants. What will be the phenotypic ratio in $F_2$ generation
A
$1:2:1$
B
$9:3:3:1$
C
$3:1$
D
$1:3$
(AIPMT-2002)
Solution
(c) $\mathop {RR}\limits_{{\text{(Red}}\,{\text{flower}})} \times \mathop {rr}\limits_{({\text{White}}\,{\text{flower}})} \xrightarrow{{}}{F_1} = Rr$
$\begin{array}{*{20}{c}}
{}&R&r\\
R&{RR}&{Rr}\\
r&{rR}&{rr}
\end{array}$
After selfing
$RR =$ Homozygous for red flower
$Rr$ and $rR$ = Heterozygous for red flower
$rr =$ homozygous for white flower
$3$ Red and $1$ White $= 3 : 1$
Standard 12
Biology
