Question

the following pedigree shows the inheritance of a genetic condition. the yellow female that introduces the gene into the family is a carrier. given the inheritance patterns in the pedigree, which types of inheritance might describe this condition? generation i ii iii normal female normal male unaffected male female introducing gene into family correct answer(s) autosomal dominant sex - linked autosomal recessive

Explanation:

1. Autosomal dominant inheritance would likely show the trait in every generation and affected individuals would have at - least one affected parent. In this pedigree, the trait skips a generation (none of the second - generation individuals are affected while some third - generation are), so it is not autosomal dominant.
2. Sex - linked inheritance patterns often show differences in expression between males and females. Since the trait appears in males in the third generation and the gene is introduced by a female carrier, it could be sex - linked (specifically X - linked recessive where the carrier female in the first generation passes the recessive allele to her male offspring in the third generation).
3. Autosomal recessive inheritance can explain the pattern where the trait skips a generation. The yellow female carrier in the first generation passes the recessive allele to her offspring in the second generation who are carriers (but not affected as they are heterozygous), and then two carriers in the second generation can have affected offspring in the third generation.

Answer:

sex - linked, autosomal recessive