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XX- XO type of sex determination is seen in crickets, grasshoppers, and some other insects. In all these organisms the female is XX and is the homogametic sex. The male is the heterogametic sex but only has one sex chromosome. The male in XX-XO systems produce gametes with (X) or without (O) a sex chromosome.

1. XX-XY method of sex determination
2. XX-XO method of sex determination
3. ZW-ZZ method of sex determination
4. None of the above

Correct answer: XX-XO method of sex determination

Solution

In the XX-XO system, females are homogametic (XX) and males are heterogametic with only one X chromosome (XO). Because the male can produce gametes with X or without a sex chromosome, this matches the XX-XO method of sex determination.

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