Q. Which of the following is a test cross?
Chhattisgarh PMTChhattisgarh PMT 2006
Solution:
Test cross is determines whether an individual is homozygous or heterozygous for dominant character. The offspring of $F_{1}$ is crossed with recessive parent. The ratio will be $1: 1$ in case of hybrid or heterozygous individual. In case of double heterozygote $(eg, RrYy)$, crossed with recessive $(rryy)$ the ratio will be $1:1:1:1$. Test cross helps to find out genotype of parents.
