Question

A common test to find the genotype of hybrid is by
A) Crossing of one ${F_2}$ progeny with a male parent.
B) Crossing of one ${F_2}$ progeny with a female parent.
C) Studying the sexual behavior of ${F_1}$ progenies.
D) Crossing of one ${F_1}$progeny with male parent.

Answer 1

Hint: Test cross is performed to know the genotype of hybrid . In this, we cross the ${F_1}$ generation progeny with the recessive parent (we do not perform selfing in them). In the case of dominant, we get the same ratio for both phenotype and genotype.

Complete answer: Test cross: crossing of ${F_1}$ progeny with the recessive parent. In this cross, the phenotypic and genotypic ratio is the same (that is $1:1$, in both cases). It is used to find out the genotype of the dominant phenotype (in the case of seed color it may be YY or Yy) individual.

Hence, the correct answer is option (D).

Note: Hybrid vigor is shown by the ${F_1}$ progeny. It means that traits of ${F_1}$ progeny are superior over both the parents traits. Example: They will have more yield than their parent crop, they will exhibit greater biomass. It is also called heterosis.