Question

the pedigree on the right shows the inheritance pattern for an x - linked recessive disorder. how many individuals are carriers of the disease but are not affected?

Explanation:

Step1: Identify carrier symbols

In X - linked recessive pedigrees, a half - shaded circle (female) represents a carrier (has one recessive allele, not affected).

Step2: Count half - shaded circles

Looking at the pedigree:

• Top generation: 1 half - shaded circle.
• Middle - lower generation: 2 half - shaded circles.

Total carriers (half - shaded circles) = 1+2 = 3.

Answer:

3