Which of the following is an example of an X-linked recessive trait in humans?
Correct answer: B. Color Blindness
- A. Hypophospatemic Rickets
- B. Color Blindness
- C. Baldness
- D. Beard Growth
Explanation
The gene responsible for color blindness is located on the X chromosome. In other words, red-green color blindness is an X-linked recessive condition. If a female inherits one normal color vision gene and one mutated gene, she won't be red-green color blind, because it's a recessive trait.
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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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