Month: September 2022

SPOROGENESIS IN PLANTS. "The formation of the plant reproductive lineages proceeds in two distinct phases: during sporogenesis, spores are formed by sporophytic (somatic) cells, whereas during gametogenesis the spores develop into mature gametophytes that harbour the male or female gametes." https://lnkd.in/ewV3vWP View in LinkedIn

DOWNSIZING GAMETOGENESIS. "During the course of evolution, the gametophytic phase of the plant life cycle, which is dominant in bryophytes (i.e. liverworts, hornworts and mosses), has been dramatically reduced to only a few cells in the angiosperms (flowering plants)." https://lnkd.in/ewV3vWP View in LinkedIn

LATE DEVELOPMENT. "Unlike in most animals, where the germline is set aside early in embryogenesis, the plant germline is determined only late in development, during floral organ formation." A critical distinction. http://dev.biologists.org/content/develop/142/2/229.full.pdf View in LinkedIn

OVULE COMMITMENT. "During sexual reproduction, only one somatic cell per ovule is usually committed to the reproductive fate. However, it is not fully understood what determines the commitment of this somatic cell to initiate germline development and what prevents the formation of additional germline cells in the same ovule." http://dev.biologists.org/content/develop/142/2/229.full.pdf View in LinkedIn

SINGLE INITIATION. "In higher plants, it has been hypothesized that the megaspore mother cell represses the formation of additional megaspore mother cells and thus restricts germline formation to only one cell per ovule." http://dev.biologists.org/content/develop/142/2/229.full.pdf View in LinkedIn

MUTANT OFFSPRING. "Over recent years, investigations into the regulatory processes governing meiosis have allowed the identification of meiotic mutants that generate unreduced gametes." http://dev.biologists.org/content/develop/142/2/229.full.pdf View in LinkedIn

TRIGGER UNRESOLVED. "In conclusion, although abiotic and oxidative stresses seems to play a role in the transition from somatic to reproductive fate and the regulation of (apo)meiosis, their potential role as a driving force promoting sexual or asexual reproduction remains unclear and warrants further investigation." https://lnkd.in/ewV3vWP View in LinkedIn

IS IT TRUE that evolution has trended in more complex organisms toward sexual reproduction? For the reason of creating greater genetic variety? We take a journey into meiosis and sex in the evolution of creatures on this planet. Why did nature bother to invent sex? View in LinkedIn

"MEIOSIS is an ancestral, highly conserved process in eukaryotic life cycles, and for all eukaryotes the shared component of sexual reproduction." https://lnkd.in/etsJH7u View in LinkedIn

MEIOSIS MAKES GERM CELLS. "Meiosis is a process where a single cell divides twice to produce four cells containing half the original amount of genetic information. These cells are our sex cells – sperm in males, eggs in females." https://lnkd.in/eF42xiU View in LinkedIn