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Chromosome evolution in insect sex
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Advanced Search Abstract Insects harbor a tremendous diversity of sex determining mechanisms both within and between groups. For example, in some orders such as Hymenoptera, all members are haplodiploid, whereas Diptera contain species with homomorphic as well as male and female heterogametic sex chromosome systems or paternal genome elimination. We have established a large database on karyotypes and sex chromosomes in insects, containing information on over species covering 29 orders of insects. This database constitutes a unique starting point to report phylogenetic patterns on the distribution of sex determination mechanisms, sex chromosomes, and karyotypes among insects and allows us to test general theories on the evolutionary dynamics of karyotypes, sex chromosomes, and sex determination systems in a comparative framework. Phylogenetic analysis reveals that male heterogamety is the ancestral mode of sex determination in insects, and transitions to female heterogamety are extremely rare.Request PDF on ResearchGate | Evolution of Sex Chromosomes in Insects | Sex chromosomes have many unusual features relative to autosomes. Y (or W). in many unrelated species, including snakes, birds, mammals and insects. In snake species where the sex-determining W chromosome apparently has J.W. JonesThe evolution of sex chromosomes and their consequences for their. Abstract. Insects harbor a tremendous diversity of sex determining mechanisms both within and between groups. For example, in some orders...the end of the story look at the video above ↑ ↑ ↑

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