ABO blood groups in humans are controlled by the gene I. It has three alleles: IA, IB, and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
Correct answer: C. Four
- A. Three
- B. One
- C. Four
- D. Two
Explanation
The three alleles IA, IB, and i of gene I in the ABO blood group system can produce six different genotypes and four different phenotypes as A , B , AB and O blood group.
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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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