Answer:
(a) In certain insects, such as
cockroach, and some roundworms, the Y-chromosome is missing so that the male
has only one sex chromosome, i.e., 'X'. The condition in the male is XO (0
means absence of one sex chromosome) and in the female it is XX, thus males
showing 17 chromosomes while females show 18 chromosome .All the other option
given are wrong.
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