CBSE Class 10 Science 2023 Outside Delhi Set 1

Question : 9 of 39

Marks: +1, -0

In an experiment with pea plants, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plant to pure short plants in

{\F}_2

, generation will be

$1: 3$
$1: 1$
$3: 1$
$2: 1$

Solution:

Explanation: Parent generation TT (pure tall)× tt(Pure dwarf)
Gametes T t

\F_1

generation Tt (heterozygous tall)

\F _2

generation

Gametes ${\Tt} →$ ${\Tt} ←$	T	t
T	TT	tT
t	tT	TT

{\F}_2

Genotypic ratio

=1

pure tall

( {\TT}): 2

heterozygous tall

( {\Tt}): 1

pure dwarf

( {\tt})

; Thus, the ratio of pure tall to pure short plants will be

1: 1

Go to Question:

Prev Question

Next Question