Category: Uncategorized

TRANSITION STATE. "The evolution of predominant self-fertilization (selfing) from cross-fertilization (outcrossing) is recognized as the most frequent evolutionary transition involving the reproductive systems of flowering plants." https://lnkd.in/dX-FzGD View in LinkedIn

SPECIES FIXATION. "Eukaryotes vary widely in numbers of mitochondria and chloroplasts per cell and in numbers of genomes per organelle, but in a given microorganism, or cell type in a multicellular organism, these values are maintained at constant levels." https://lnkd.in/ebVhXPf View in LinkedIn

"PURIFYING SELECTION reduces the frequency of deleterious alleles in the population." https://lnkd.in/dU2Q65U View in LinkedIn

REPLICATION COORDINATION. "Because the growth rate of free-living Synechococcus (6–12 h doubling time) far exceeds the growth rate of testate amoebas (1–3 d doubling time), the imposition of such control is presumably an early and critical event in establishing any endosymbiotic relationship, preventing the engulfed bacterium from overwhelming the host cell, and it was presumably quickly established during the protoeukaryote’s acquisition of protomitochondria and protochloroplasts." https://lnkd.in/ebVhXPf View in LinkedIn

SPECTACULAR OUTCOMES. "Although nothing is known about the speciosity of the last eukaryotic common ancestor itself, evolutionary history indicates that the tendency to speciate was instantiated early. Hence the “Why sex?” question has yet another answer: It offers the means to diversify in a eukaryote-specific fashion, one that has had spectacular outcomes." https://lnkd.in/ebVhXPf View in LinkedIn

ENGULFMENT SOLVED. "Importantly, what is already in place in Paulinella is a mechanism to coordinate the replication of the cyanelle’s DNA with the replication of the amoeba’s DNA such that, at each mitosis, each daughter cell inherits two cyanelles." https://lnkd.in/ebVhXPf View in LinkedIn

MATING TYPE. "Genome rearrangements and chromosomal translocations lead to postzygotic blocks to sexual reproduction, but if an individual with a rearranged genome simply switches mating type, it now has a mate with a colinear genome with whom to found a new species." https://lnkd.in/ebVhXPf View in LinkedIn

SEX GENES AND SPECIATION. "Postzygotic incompatability between nuclear and mitochondrial genomes or between multiple nuclear loci have both been shown to play a role in Saccharomyces species incompatibilities. Hence sex-related genes are integral to establishing species boundaries." https://lnkd.in/ebVhXPf View in LinkedIn

EUKARYOTIC SPECIATION. "A signature feature of eukaryotes is that they speciate, segregating into closely related populations that fail to respond to each other’s mating cues to form zygotes (prezygotic isolation) and/or form zygotes that fail to produce a viable next generation (postzygotic isolation)." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

PLASTID ELIMINATION. "In land plants, plastids are excluded from the sperm cell or are left behind in synergid cells during fertilization; mechanisms are again unknown." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn