The gene I at chromosome no. 9 of human population have:
Correct answer: B. Three alleles
- A. Two alleles
- B. Three alleles
- C. Four alleles
- D. Five alleles
Explanation
The gene I on chromosome 9 is involved in determining the ABO blood group system in humans. It has three alleles: IA, IB, and i. The combination of these alleles results in the four possible blood types: A (IA), B (IB), AB (IA and IB), and O (i). Options stating two, four, or five alleles are incorrect because they do not accurately reflect the number of alleles for the gene I.
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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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