Final answer:
The chromosomes needed for an embryo to become a female are XX, while those needed for an embryo to become a male are XY.
Step-by-step explanation:
In humans, the chromosomes needed for an embryo to become a female are XX, while those needed for an embryo to become a male are XY. These chromosomes carry the genetic information that determines the sex of an individual. In a female, both sex chromosomes are X, whereas in a male, one sex chromosome is X and the other is Y.
Learn more about Chromosomes and sex determination