Question

which pedigree symbol is used to represent a female carrier of a recessive x - linked trait?

Explanation:

In pedigree charts, a circle represents a female. A carrier (for X - linked recessive) is shown by a half - filled (or half - colored) circle. The first option is a blank circle (unaffected female), the third is a square (male), the fourth is a filled square (affected male). The second option (half - colored circle) represents a female carrier.

Answer:

The second option (the circle that is half - colored, e.g., the one with a purple half and a white half)