How many phenotypes are possible for human ABO blood groups?
Correct answer: B. 4
- A. 2
- B. 4
- C. 6
- D. 8
Explanation
There are four possible phenotypes for human ABO blood groups. A, B, AB, and O. This is due to the presence or absence of two antigens (A and B) on the surface of red blood cells, and the presence of absence of antibodies against these antigens in the plasma.
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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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