Consider this pedigree for the following questions. 9. What is the most probable
ID: 23193 • Letter: C
Question
Consider this pedigree for the following questions.
9. What is the most probable mode of inheritance for this family pedigree?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked
10. How Is it possible for the unaffected female (6) depicted by the arrow in Generation II to produce two affected sons because her mate/spouse is unaffected as well?
A) Because spontaneous mutations often occur and manifest in offspring irregardless of the parent's genetic makeup.
B) Because the son's father is a carrier of the mutant recessive allele.
C) Because the sons inherited a dominant allele for the phenotype to be demonstrated from their mother or father
D) Because males are hemizygous for all genes on the X chromosome and demonstrate phenotype for an X-linked gene.
Explanation / Answer
D) X-linked dominant D) Because males are hemizygous for all genes on the X chromosome and demonstrate phenotype for an X-linked gene.