Female heterogamety is

The correct answer is ZW - ZZ

Explanation:

• Sex-determination mechanisms vary among different organisms. One of the mechanisms is female heterogamety.
• Heterogametic sex refers to the sex that has two different sex chromosomes, while homogametic sex has two of the same kind.
• In female heterogamety, females have two different types of sex chromosomes (e.g., ZW), while males have two of the same type (e.g., ZZ)
  • ZW - ZZ: In this system, females are ZW (heterogametic), and males are ZZ (homogametic). This system is common in birds, some fish, and some insects. The Z chromosome carries genes essential for development, while the W chromosome often determines femaleness.
  • XX - XY: This is not an example of female heterogamety. In this system, males are the heterogametic sex (XY), and females are the homogametic sex (XX). This system is found in humans and many other mammals.
  • XX - XO: This is also not an example of female heterogamety. In this system, females are the homogametic sex (XX), and males have only one X chromosome and no corresponding Y chromosome (XO). This system is found in certain insects, such as grasshoppers.
  • YY - XX: This option is incorrect because it does not represent any known sex determination system. Typically, the Y chromosome is associated with males, and the XX combination is associated with females.