The ABO blood group system illustrates
Correct answer: D. multiple alleles, three of which exist at one locus
- A. a single pair of alleles at one locus
- B. two separate genes on two chromosomes
- C. sex linked inheritance
- D. multiple alleles, three of which exist at one locus
Explanation
The gene has three alleles in the population, I A, I B and i, though any one individual carries only two of them, and this is the definition of multiple allelism. The three alleles combine into six genotypes producing four phenotypes. The locus is on an autosome, so the trait appears equally in men and women and has nothing to do with sex linkage.
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About Mendel's Laws of Inheritance
Mendelian inheritance explains how alleles separate into gametes and assort during reproduction, producing predictable genotype and phenotype ratios. Questions cover dominance, recessiveness, homozygous and heterozygous conditions, the laws of segregation and independent assortment, monohybrid and dihybrid crosses, test crosses and the limits caused by linked genes.
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