The genotypes of a husband and wife are IAIB and IAi.Among the blood types of their children, how many different genotypes and phenotypes are possible?
Correct answer: B. 4 genotypes; 3 phenotypes
- A. 3 genotypes; 4 phenotypes
- B. 4 genotypes; 3 phenotypes
- C. 4 genotypes; 4 phenotypes
- D. 3 genotypes; 3 phenotypes
Explanation
Gametes IA /IB × I /i produce genotypes IA IA, IA i, IAIB , IB i (4 genotypes). Phenotypes collapse to A (IA IA /IA i), AB (IAIB ), B (IB i) → 3 phenotypes.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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