Question

what chromosomes signal females? a xy b xx c yy d xz

Explanation:

In humans, the sex - determining chromosomes are X and Y. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). The combination YY is not a normal human sex - chromosome combination as humans typically have one pair of sex chromosomes. XZ is not a standard human sex - chromosome combination.

Answer:

B. XX