Question

To determine the genotype of a tall plant of $F_2$ generation, Mendel crossed this plant with a dwarf plant of $F_2$ generation. This cross represents a ______.

• A. test cross
• B. back cross
• C. reciprocal cross
• D. dihybrid cross

Answer 1

Answer: (A)

A test cross is a process to examine and identify whether the organism is heterozygous or not. In it, the organisms are crossed with the recessive homozygous as it will ensure the expression of the dominant character in heterozygous form for $F_1$ generation enabling us to know the zygosity. The ratio obtained in $F_1$ generation after crossing the heterozygous individual with a recessive homozygous individual is $1:1$ .
A test cross is a type of back cross.
The Dihybrid cross is when two pairs of contrasting characters are crossed between homozygous members for those characters.
The reciprocal test is a method to determine the role of the parent in the expression of characteristics. The male and female members are interchanged for a particular set of characters to study the influence of parental gender in expression.