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In which of the following is XX-XO sex chromosome complement found?

(a) Chimpanzee

(b) Birds

(c) Honeybee

(d) Cockroach

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Answer is : (d) Cockroach

In cockroach, XX-XO sex chromosome complement is found. In this pattern, the female has two X-chromosomes (called XX) while male has only one X-chromosome (called XO). The X-chromosome is completely absent here. Thus, the presence of unpaired X-chromosome determines the masculine sex. The female produces only one type of eggs and male produces two types of sperms, i.e. 50% with one X-chromosome and 50% without any sex chromosome.

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