Pick up the disorder that occurs by one recessive allele in men but by two recessive alleles in women:
Correct answer: D. Hemophilia - A and B
- A. Hemophilia - A
- B. Hemophilia - C
- C. Hemophilia - B
- D. Hemophilia - A and B
Explanation
Hemophilia A and hemophilia B are inherited in an X-linked recessive pattern . The genes associated with these conditions are located on the X chromosome, which is one of the two sex chromosomes . In males (who have only one X chromosome), one altered copy of the gene in each cell is sufficient to cause the condition. In females, two of them are needed .In females, two of them are needed .
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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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