Problem: Why are recessive X-linked traits seen more in human males than in human females? Select all that apply.A. Males have an X chromosome, but females do not.B. Actually, X-linked traits are seen more often in females than in males, because they have two X chromosomes.C. Males don't have a second X chromosome to mask the effects of the first one.D. This phenomenon is due to X-inactivation.E. While females would need two of these alleles to express the recessive phenotype, males only need one.F. Sperm are more likely to carry an X chromosome than a Y chromosome.

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The physical traits of an individual (phenotype) would largely depend the genotype. For an individual to show a recessive trait, the individual should have the recessive allele on all of its homologous chromosomes. 

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Problem Details

Why are recessive X-linked traits seen more in human males than in human females? Select all that apply.

A. Males have an X chromosome, but females do not.

B. Actually, X-linked traits are seen more often in females than in males, because they have two X chromosomes.

C. Males don't have a second X chromosome to mask the effects of the first one.

D. This phenomenon is due to X-inactivation.

E. While females would need two of these alleles to express the recessive phenotype, males only need one.

F. Sperm are more likely to carry an X chromosome than a Y chromosome.

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Our tutors have indicated that to solve this problem you will need to apply the Chromosomal Theory of Inheritance concept. You can view video lessons to learn Chromosomal Theory of Inheritance. Or if you need more Chromosomal Theory of Inheritance practice, you can also practice Chromosomal Theory of Inheritance practice problems.