NEET BIOLOGY

Detailed explanation-1: -A cross between a homozygous plant with recessive traits and a heterozygous plant is known as a test cross. A test cross is a valuable tool in predicting the genotype of the organism in question.

Detailed explanation-2: -Because homozygous dominant and heterozygous individuals are phenotypically identical, the observed traits in the F2 offspring will exhibit a ratio of three dominant to one recessive.

Detailed explanation-3: -For example, if one parent is homozygous dominant (WW) and the other is homozygous recessive (ww), then all their offspring will be heterozygous (Ww) and possess a widow’s peak. If both parents are heterozygous (Ww), there is a 75% chance that any one of their offspring will have a widow’s peak (see figure).

Detailed explanation-4: -The two normal genes having the different variants are known as heterozygous. The probability of the homozygous offspring is ¼, and the probability of heterozygous offspring is ½.