Sex determination in butterflies

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The zw sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), and some reptiles, including komodo dragons. The letters z and w are used to distinguish this system from the xy sex-determination system. In this system, female has a pair of dissimilar zw chromosomes and male has two similar zz chromosomes. Uv sex determination separate sexes are only found in the haploid phase of the life cycle of an individual (e. Polygenic sex determination sex is determined by multiple genes (e.).   sex in organisms is determined by sex chromosomes or environmental factors. Sex determination in flies, fruitflies and butterflies article literature review (pdf available) in genetica 116(1)15-23 september 2002 with 2,395 reads how we measure reads. Mechanisms of sex determination chromosomal sex determination in flies and mammals females are the homogametic sex (xx) and males the heterogametic sex (xy). In butterflies and birds males are the homogametic sex (zz) and females the heterogametic sex (zw). Drosophila melanogaster (fruit fly) xx females xy males xautosome ratio determines sex 1. How can you determine the sex of a butterfly? Being able to tell the difference between male and female butterflies and moths can be easily determined or difficult depending on the species. Some species such as the painted lady butterfly look the same in color and markings and can only be differentiated by examining anatomical structures. In butterflies, males have only one type of sex chromosome (z) whereas females have two different types of sex chromosomes (z and w). But just as in humans, the probability that a caterpillar will develop into a male is 12 and the probability that it will develop into a female is 12. In butterflies, sex is determined by the zw sex-determination system. Female butterflies are heterogametic and have both a z sex chromosome and a w sex chromosome for sex determination. In contrast, male butterflies are homogametic and have two z sex chromosomes.

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