ABO blood system has:
Correct answer: B. Four different phenotypes
- A. Two different phenotypes
- B. Four different phenotypes
- C. Three different phenotypes
- D. Five different phenotypes
Explanation
The ABO blood group system is characterized by four different phenotypes: A, B, AB, and O. These phenotypes arise from the presence or absence of specific antigens on the surface of red blood cells. Option B is correct because it accurately lists the four phenotypes. Options A, C, and D are incorrect as they provide an incorrect number of phenotypes, either underestimating or overestimating the actual number in the ABO system.
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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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