A) The crossing of \[{{F}_{1}}\] individual with homozygous recessive.
B) Crossing an \[{{F}_{1}}\] individual with either of the two parents.
C) Crossing \[{{F}_{1}}\] individual with another \[{{F}_{1}}\] individual.
D) Crossing \[{{F}_{1}}\] individual with that of \[{{F}_{2}}\].
Correct Answer: A
Solution :
[a] A test cross is a cross involving the mating of \[{{F}_{1}}\] individual with the homozygous recessive parent. It is done to find out homozygous and heterozygous individuals. The offsprings will be 100% dominant if the individual was homozygous dominant and the ratio will be 50% dominant and 50% recessive in case of hybrid or heterozygous individual Here, AaBb, should be crossed with aabb. As aabb will produce only one type of gamete thus difference in traits if observed in their progenies will be due to the different gametes produced by hybrid dominant parent. This will indicate the genotype of the dominant parent.
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