Types Of Chromosome In Insects

Autosomal chromosomes are usually represented as two haploid sets, one from each parent, in the diploid tissues of insects. With the addition of the sex chromosomes from each parent, the haploid set is known as "n" and the diploid set as "2«." Major exceptions to diploidy in both sexes occur, such as in almost all species in the the orders Hymenoptera (ants, bees, and wasps), Thysanoptera (thrips), and some species of Heteroptera and Coleoptera, where the females are diploid, the males being normally haploid (i.e., derived from unfertilized eggs, arrhenotoky). Arrhenotoky determines the sex of

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