In mammals, which type of phenotypic expression will show recessive traits more frequently in males than females?
Correct answer: D. X-linked
- A. Incomplete dominance
- B. Complete dominance
- C. Codominance
- D. X-linked
Explanation
Option D is correct as males have an X and a Y chromosome, and if the recessive alleles are linked to the X chromosome, then it will be expressed in the phenotype. If a female has an "X linked" recessive allele, then unless the other X chromosome has a recessive allele, the gene won't express itself in the phenotype.
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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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