Principle of Inheritance and VariationMediumBloom L1
Question
In order to find out the different types of gametes produced by a pea plant havina the genotype AaBb, it should be crossed to a plant with the genotype
Options
A.aaBB
B.AaBb
C.AABB
D.aabb
Solution
(c) [Key Concept: Test Cross — Gamete Identification] To find the different types of gametes produced by AaBb, it should be crossed with aabb (homozygous recessive for all loci). The aabb parent produces only one type of gamete (ab), so the offspring phenotypes directly reveal the gamete types of the AaBb parent. AaBb produces 4 gamete types (AB, Ab, aB, ab), yielding 4 phenotypic classes in offspring when crossed with aabb — corresponding to each gamete type.
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