Question

A cross between a tall plant (TT) and a short plant (tt) resulted in progeny that were all tall plants because:
[1 Mark]
[Lakhmir Singh and Manjit Kaur]
[Dominant Trait]

• A. height of plant is not governed by gene T or t
• B. tallness is the recessive trait
• C. tallness is the dominant trait
• D. shortness is the dominant trait

Answer 1

The correct option is C tallness is the dominant trait

Solution:
The correct answer is option A: tallness is the dominant trait [1 Mark]
Dominant trait masks the effect of the recessive trait. So, in this question, the tall trait (reflected by allele T), will mask the effect of the recessive dwarf trait (reflected by allele t) when present in a heterozygous state i.e. Tt.

Gametes	T	T
t	Tt - Tall	Tt - Tall
t	Tt - Tall	Tt - Tall