Question

Recessive traits with this type of inheritance pattern are more common in men than in women, and examples include color blindness and hemophilia. What type of inheritance pattern does this describe?

A) X-linked recessive
B) Autosomal dominant
C) Autosomal recessive
D) Codominant inheritance

Answer 1

The inheritance pattern that results in recessive traits such as color blindness and hemophilia being more common in men than in women is X-linked recessive.

Step-by-step explanation:

The inheritance pattern described by the student is X-linked recessive. This pattern is more common in men because they have only one X chromosome, and therefore just one allele for each X-linked trait. Thus, if that allele is defective, the recessive trait will be expressed. In contrast, females have two X chromosomes and thus two alleles for each X-linked trait; they must inherit two copies of the recessive allele to express the trait. If a female has only one recessive allele, she is a carrier, which means she can pass the trait to her offspring but does not exhibit the symptoms. Examples of conditions inherited in an X-linked recessive pattern include color blindness and hemophilia.