Which of the following trait is not X-linked?
Correct answer: D. Leukemia
- A. Colour blindness
- B. TFM (Testicular Feminization)
- C. Haemophilia
- D. Leukemia
Explanation
The correct option is D) Leukemia. Leukemia is a form of cancer affecting blood and bone marrow, resulting from genetic mutations not linked to sex chromosomes. In contrast, the other conditions-Color blindness, Testicular Feminization, and Hemophilia-are all X-linked traits. These X-linked conditions primarily affect males more frequently because males have only one X chromosome, so a single defective gene on the X chromosome can result in the condition.
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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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