A male or female child of an affected mother has 50% chance of acquiring the disorder. Such a disorder is:
Correct answer: B. X linked dominant disorder
- A. X linked recessive disorder
- B. X linked dominant disorder
- C. Y linked dominant disorder
- D. Y linked recessive disorder
Explanation
An X-linked dominant disorder is a genetic condition that is caused by a mutation in a gene located on the X chromosome. Since females have two X chromosomes, they have two copies of the gene, while males have only one X chromosome and one copy of the gene.In the case of an X-linked dominant disorder:- A female with the mutated gene (Xm) has a 50% chance of passing it to each of her children (both sons and daughters).- A male with the mutated gene (Xm) will pass it to all of his daughters (who will be carriers) but none of his sons (who will not inherit the X chromosome).The 50% chance of acquiring the disorder mentioned in the question is consistent with an X-linked dominant disorder.
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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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