Category: Uncategorized

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

WRONG OLDER THEORY. "We uncover a striking diversity of sex chromosome configurations in Diptera, concealed underneath superficially similar karyotypes displaying male heterogamety. This diversity is in sharp contrast to the theory that differentiated sex chromosomes are highly stable and unlikely to be replaced, exemplified by the mammalian X, and emphasizes the importance of studying a variety of clades to obtain a truly global understanding of sex chromosome evolution." https://lnkd.in/dX2rADH View in LinkedIn

EVOLUTION OF TWO SEXES. "Sex chromosomes evolved from ordinary autosomes that acquired a sex-determining function and stopped recombining. Over evolutionary time, sex chromosomes differentiate, and the sex-limited chromosome—which is entirely sheltered from recombination—degenerates." https://lnkd.in/dX2rADH View in LinkedIn

TWISTS AND TURNS. "Some species have newly gained or secondarily lost their sex chromosomes; in others, a different chromosome has replaced the original sex chromosome or multiple chromosomal elements have become incorporated into the sex chromosomes; still other species have female heterogametic sex chromosomes." https://lnkd.in/dX2rADH View in LinkedIn

PARALLEL EVOLUTION. "Transcriptome analysis shows that dosage compensation has evolved multiple times in flies, consistently through up-regulation of the single X in males. However, X chromosomes generally show a deficiency of genes with male-biased expression, possibly reflecting sex-specific selective pressures." https://lnkd.in/dX2rADH View in LinkedIn