The gene which controls the ABO group has how many alleles in an individual?
Correct answer: B. 2
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
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. However, a single individual has two ABO blood type alleles, because we each inherit one blood type allele from our biological mother and one from our biological father. Hence, the correct answer is B.
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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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