Question

If two heterozygous tall garden pea plants are crossed, the expected genotypic ratio in their offspring is

• A. 3 : 1
• B. 1 : 1
• C. 1 : 2 : 1
• D. 1 : 0

Hint:

Crossing two heterozygous individuals (Tt × Tt) always gives a genotypic ratio of 1:2:1 and a phenotypic ratio of 3:1.

Answer 1

The Correct Option is C

Step 1: Understand heterozygous cross.
Heterozygous tall plants have the genotype \texttt{Tt}. Crossing two such plants: \texttt{Tt × Tt} Step 2: Perform Punnett square analysis. \[ \begin{array}{c|c|c} & T & t
\hline T & TT & Tt
t & Tt & tt
\end{array} \] Step 3: Determine genotypic ratio.
- TT (homozygous tall) = 1
- Tt (heterozygous tall) = 2
- tt (dwarf) = 1 So, genotypic ratio = 1 : 2 : 1