Month: September 2022

REVERSE MEIOSIS. "In normal meiosis, homologous chromosomes are separated during meiotic division I whereas sister chromatids are separated during meiosis II. Why meiosis generally follows this order is unknown, but interestingly, meiosis can also take place in the reverse order in some species, including some flowering plants, mites, true bugs, and mealybugs." https://lnkd.in/e2tp_G5 View in LinkedIn

UNRESOLVED UNIVERSALITY. "The question of why one order of meiotic divisions is almost universal therefore remains unresolved." https://lnkd.in/e2tp_G5 View in LinkedIn

NO FERTILIZATION. "Many organisms have abandoned canonical sexual reproduction, reproducing asexually by suppressing or modifying meiosis and producing diploid eggs that can develop without fertilisation." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn

SEXUAL REVERSAL. "Examples of meiosis-derived modes of asexual reproduction include chromosome doubling prior to meiosis (“endomitosis” or “pre-meiotic doubling”), fusion of two of the four products of a single meiosis (“automixis” in animals, “within-tetrad mating” in fungi), and suppression of one of the two meiotic divisions." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn

ASEXUAL MUTANTS. "The question of how a mitotic asexual mutant can invade a sexual species is at the heart of the debate on the evolutionary maintenance of sex, as this is what is investigated in most theoretical models, and is the situation where the cost of sex is most evident." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn

SECONDARY ASEXUALITY. "Unless meiosis can be entirely bypassed (as e.g. with vegetative reproduction), secondary asexuality is likely to evolve via modification of meiosis, keeping much of the cell signalling and machinery intact." https://lnkd.in/e2tp_G5 View in LinkedIn

TRANSITION TO ASEXUALITY. "In many cases, the initial evolution of asexuality may thus resemble the evolution of self-fertilisation, and several traits may pre-exist (such as low recombination rates) that make the successful transition to asexuality more likely in some taxa." https://lnkd.in/e2tp_G5 View in LinkedIn

CORE TO BOTH PATHWAYS. "Meiosis is a key step in sexual life cycles, as well as some asexual life cycles derived from sexual ancestors." https://lnkd.in/e2tp_G5 View in LinkedIn

CELLULAR BOTTLENECK. "In multicellular eukaryotes, where meiosis is tightly associated with reproduction (unlike in many protists), meiosis is also a cellular and genetic bottleneck at the critical transition between the diploid and the haploid phases." https://lnkd.in/e2tp_G5 View in LinkedIn

SOMATIC CONTROL. "In metazoans, life cycles are mostly determined by the extent of somatic development within each phase rather than by the timing of meiosis, which can be halted or postponed." http://biorxiv.org/content/biorxiv/early/2016/04/28/050831.full.pdf View in LinkedIn