Question

What feature(s) of this pedigree indicate(s) X-linked recessive inheritance?

(Figure 25.4)

Answer 1

The presence of affected males inheriting the disease from their carrier mothers and the absence of affected fathers passing on the disease to their sons indicate X-linked recessive inheritance in a pedigree.

Step-by-step explanation:

In a pedigree, X-linked recessive inheritance can be indicated by certain features. One key feature is the presence of affected males who inherit the disease from their carrier mothers. This is because males have one X chromosome, and if they receive the disease-causing X chromosome from their carrier mother, they will be affected. Another feature is the absence of affected fathers passing on the disease to their sons. This is because fathers pass on their Y chromosome to their sons, which does not carry the disease-causing gene.