Sex Chromosomes evolution: Sharing outside of pairing
نویسندگان
چکیده
منابع مشابه
Plant Evolution: Modern Sex Chromosomes
The first detailed map has been produced of a plant chromosome carrying sex-determining genes. The new data show that, in papaya, these genes lie in a quite extensive non-recombining region. This region is nevertheless a small part of the papaya genome compared with other male-specific genome regions, such as mammalian Y chromosomes.
متن کاملReconstructing the evolution of vertebrate sex chromosomes.
Sex chromosomes and their evolution have captivated researchers since their discovery. For more than 100 years, the dominant model of sex chromosome evolution has held that differentiated sex chromosomes, such as the X and Y chromosomes of mammals or the Z and W chromosomes of birds, evolved from ordinary autosomes, primarily through the degeneration of the sex-specific Y or W chromosome. At th...
متن کاملEVOLUTION OF DIOECY and SEX CHROMOSOMES
Why are there two sexes in certain species, instead of one hermaphroditic sex? Why are Y chromosomes shorter than X chromosomes, but only in certain lineages? I propose that differences between sexes are initially determined by differential methylation in nuclear DNA between females and males, driving Muller’s ratchet. Methylation of promoters suppresses transcription, including loci coding for...
متن کاملMicroReview Evolution of fungal sex chromosomes
Sexual reproduction enables organisms to shuffle two parental genomes to produce recombinant progeny, and to purge the genome of deleterious mutations. Sex is conserved in virtually all organisms, from bacteria and fungi to plants and animals, and yet the mechanisms by which sexual identity are established share both conserved general features and are remarkably diverse. In animals, sexual iden...
متن کاملEvolution of Sex Chromosomes in Mammals
It appears that despite diversity, all mammals are essentially endowed with the same genome, in that most of the gene loci contained in the gehome of one species are included in that of the other species. The comparison of amino acid sequences of peptide chains produced by a set of duplicated genes illustrates this point. For instance, mammalian hemoglobin is a symmetrical tetramer made of an a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1984
ISSN: 0028-0836,1476-4687
DOI: 10.1038/311106a0