A) Ww \[\times \] ww
B) WW \[\times \] ww
C) Ww \[\times \] Ww
D) ww \[\times \] ww
Correct Answer: A
Solution :
Test cross is a cross between an individual with a dominant trait and a recessive organism (or parent) in order to know whether the dominant trait is homozygous (all offspring with dominant trait) or heterozygous (50% offspring with dominant trait and 50% with recessive trait). A double heterozygote on test cross yields a ratio of 1 : 1 : 1 : 1, such a test cross is also called dihybrid test cross. If the subject is heterozygous for the second character, the test cross will yield 1 : 1 ratio like the one obtained in monohybrid test cross. Therefore, in the given options, the test cross is Ww \[\times \]ww.
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