Evolution of sex determination mechanisms and sex chromosomes
نویسندگان
چکیده
منابع مشابه
Sex chromosomes, sex determination, and sex-linked sequences in Microtidae.
The Arvicolidae is a widely distributed rodent group with several interesting characteristics in their sex chromosomes. Here, we summarize the actual knowledge of some of these characteristics. This mammalian group has species with abnormal sex determination systems. In fact, some species present the same karyotype in both males and females, with total absence of a Y chromosome, and hence of SR...
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Mechanisms of vertebrate sex determination are reviewed in the light of what is known about the origin and evolution of sex chromosomes. All vertebrate males have testes that are similar in anatomy and in spermatogenesis. Despite a variety of sex chromosome systems, the same cascade of genes operate in the differentiation of testes and male genitalia. Only the primary signal or switch that init...
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Turtle karyotypes are highly conserved compared to other vertebrates; yet, variation in diploid number (2n = 26-68) reflects profound genomic reorganization, which correlates with evolutionary turnovers in sex determination. We evaluate the published literature and newly collected comparative cytogenetic data (G- and C-banding, 18S-NOR, and telomere-FISH mapping) from 13 species spanning 2n = 2...
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ژورنال
عنوان ژورنال: SCIENTIA SINICA Vitae
سال: 2019
ISSN: 1674-7232
DOI: 10.1360/n052018-00208