Question

In a pea plant with dominant tall trait represented by $T$ and recessive short trait by $t$, a test cross is represented by

• A. Tall $\times TT$
• B. Tall $\times Tt$
• C. Tall $\times tt$
• D. $TT\times Tt$
• E. Short $\times Tt$

Answer 1

The correct option is C Tall $\times tt$

A cross between two organisms, one of which has an unknown genotype and the other with a homozygous recessive trait is called a test cross. This cross was first performed by Gregor Mendel and is used to detect the unknown genotype of a particular organism. It is a valuable tool in genetics. Hence a cross of pea plants in which one of the parents has a homozygous recessive genotype is called a test cross. Thus the correct answer is option C.