Of a normal couple, half the sons are hemophiliac while half the daughters are carriers. The gene is located on:
Correct answer: C. one X-chromosome of mother
- A. X-chromosome of father
- B. Y-chromosome of father
- C. one X-chromosome of mother
- D. both the X-chromosomes of mother.
Explanation
The gene is located on one X-chromosomes of mother. Cross between a hemophilic carrier female X h X and normal male would yield 50% of the sons being hemophilic and 50% of the daughter are carriers.
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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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