Question

The Punnett square below shows a cross between a pure tall and heterozygous tall plant. What will be the percentage of tall offspring?

Gamete	T	T
T	TT	TT
t	Tt	Tt

• A. None are short
• B. $25\%$ are short
• C. $50\%$ are short
• D. $75\%$ are short
• E. All are short

Answer 1

The correct option is A None are short

Cross is shown between a pure tall (TT) and heterozygous tall plant (Tt) and it produces TT:Tt in the ratio of 1:1. T is dominant and t is recessive (dominant trait will mask the effect of the recessive trait). Therefore, TT and Tt both are tall plants and there are no short plants.

Therefore, the correct answer is option A.