Mendel's laws, sex determination, mutations, pedigree analysis, chromosomal theory.
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Q1 · Inheritance and Variation (Genetics) (Class 12) · EASY
In a dihybrid cross between two heterozygous pea plants (RrYy × RrYy), where R represents round seeds (dominant over wrinkled r) and Y represents yellow colour (dominant over green y), what is the expected phenotypic ratio in the F2 generation?
Q2 · Inheritance and Variation (Genetics) (Class 12) · MEDIUM
A woman with normal vision (carrier for colour blindness) marries a man with normal vision. Colour blindness is an X-linked recessive trait. What percentage of their sons are expected to be colour blind?
Q3 · Inheritance and Variation (Genetics) (Class 12) · HARD
In humans, the ABO blood group system involves three alleles: I^A, I^B, and i. A man with blood group AB (I^A I^B) marries a woman with blood group O (ii). Their daughter marries a man with blood group B (I^B i). What is the probability that this couple's child will have blood group AB?