Category: Uncategorized

STEPPED STRATA. "Such a recombination restriction occurred in a stepwise manner along most of the sex chromosomes in parallel in birds and mammals (creating so-called “evolutionary strata”), apart from small pseudoautosomal regions (PARs) that maintain recombination." https://lnkd.in/gxyp7ei View in LinkedIn

TWO SYSTEMS. "Genetic sex-determining systems in vertebrates include two basic types of heterogamety, which are represented by the XX/XY and ZZ/ZW types. Both types occur among amphibian species." https://lnkd.in/gFCg7HY View in LinkedIn

EVOLUTION. "Sex chromosomes originate from ordinary autosomes. Ancient sex-specific W or Y chromosomes, like that of female chicken or those of male mammals, usually have lost most functional genes, owing to a loss of recombination with their former homologs, the Z or X chromosomes." https://lnkd.in/gxyp7ei View in LinkedIn

FAST EVOLUTION. "Structurally, sex chromosomes are the most rapidly evolving parts of the genome in many groups of animals." https://lnkd.in/g2CPWtY View in LinkedIn

SEX CHROMOSOMES. "We will restrict the term to chromosomes that carry the genes controlling male or female development, defining the male–female dichotomy in terms of gamete size differences, which are absent in other systems." https://lnkd.in/gCh5RAX View in LinkedIn

CHROMOSOME NUMBER. "The number of chromosomes is one of the most fundamental features of a eukaryotic genome. Chromosome number varies, both between closely related species and within species, and such variation can contribute to divergent adaptation and speciation." https://lnkd.in/g2CPWtY View in LinkedIn

‘We are with you Catalunya’ – the revolt in Spain is bigger than flags and language. History is unfolding. https://www.theguardian.com/commentisfree/2017/oct/02/catalans-independence-revolt-spain-independence-flags?CMP=Share_iOSApp_Other View in LinkedIn

COMBINED SETS. "A well-known case is that of the Japanese wrinkled frogs, Rana rugosa, where separate XY and ZW populations exist. All four sex chromosomes are descendants of the same linkage group. They have diverged independently already carrying different sets of lethal genes." http://www.pnas.org/content/112/34/10575.full View in LinkedIn

US body clock scientists win Nobel prize http://www.cnn.com/2017/10/02/health/nobel-medicine-prize-circadian-rhythm/index.html View in LinkedIn

BATTLING FORCES. "The evolution of sex chromosomes is likely shaped by the interplay between sex-specific and sexually antagonistic forces, mechanistic constraints, and selective pressures to preserve the regulation of ancestral gene expression." https://lnkd.in/dX2rADH View in LinkedIn