Question

which pedigree symbol is used to represent a female carrier of a recessive x - linked trait? (with four options, including a circle, a half - colored circle, a square, and a colored square)

Explanation:

In pedigree charts, a circle represents a female. A female carrier of a recessive X - linked trait is typically represented by a circle that is half - filled (or has a half - shaded region). The first option (empty circle) is a normal female, the third (square) is a male, the fourth (filled square) is an affected male. The second option, the half - shaded circle, is the symbol for a female carrier.

Answer:

The second option (the circle with half shaded, i.e., the circle that is divided into two halves with one half colored)