منابع مشابه
Sex Determination: Primitive Y Chromosomes in Fish
Recent analyses of the chromosomal regions that determine male development in sticklebacks and medaka have revealed several features associated with incipient Y chromosome evolution, including suppressed crossing over and the accumulation of repetitive DNA.
متن کاملSex 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...
متن کاملPlant Sex Chromosomes: A Non-Degenerated Y?
Animal Y chromosomes have undergone chromosome-wide degeneration in response to a lack of recombination, and ancient Ys contain few functional genes. Recent research suggests that plant Y chromosomes may evolve differently and retain most of their ancestral genes.
متن کاملSex chromosomes: how X-Y recombination stops
In many animal and plant species, sex determination involves an homologous but heteromorphic chromosome pair, the X and Y sex chromosomes. These chromosomes generally differ greatly in length and sequence content, except in the ‘pseudoautosomal’ region, where X-Y recombination still occurs in male meiosis. In a pioneering study, Lahn and Page [1] investigated the highly differentiated and nonre...
متن کاملAneuploidy Assessment of X, Y, 18 Chromosomes in Sperm of Oligoteratospermia Using FISH Technique
Introduction: Not being to get pregnant, after one year of unprotected sex is called infertility. In the post, infertility was mainly a female problem, but the role of male factors in infertility has denotation, although a greater percentage of this infertility is related to the deficiencies of semen. Methods: This case-control study was performed on sperm samples from 30 infertile oligoterato...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2004
ISSN: 0960-9822
DOI: 10.1016/j.cub.2004.09.009