The "d" and "D" alleles are used for lighter and darker skin colour in humans, respectively. By keeping in view the inheritance pattern of skin colour in human beings(controlled by 3 genes), choose which combination shows medium skin colour from the following picture:
Correct answer: B. Column C
- A. Column A
- B. Column C
- C. Row B
- D. Row C
Explanation
C can be eliminated first because human skin color is determined by more than one gene. Between A and B, A cannot be correct because it shows homozygous recessive genotypes for all three genes, which would result in fair skin. B is correct because column C shows an equal number of dominant and recessive alleles, which would result in a medium skin color.
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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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