Category: Uncategorized

PRECONDITION. "In order for haploid products to recapitulate these events, and hence again avail themselves of the advantages of diploidy, they must in turn fuse together to create diploids that are both capable of meiosis and precluded from undergoing additional fusion events." https://lnkd.in/ebVhXPf View in LinkedIn

CHIASMATA ROLE. "Independent assortment produces diversity in the meiotic products of heterozygotes regardless of levels of crossing over, and chiasmata have been shown to play an additional role, aligning homologous chromosomes and providing tension on the spindle for accurate meiosis I segregation." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

BENEFITS OF HALVING. "Although the initial pressure to develop meiosis may have been to effect ploidy reduction, the process evolved into something far more sophisticated: a mechanism to generate complete chromosome sets during meiosis I and then halve their ploidy during meiosis II." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

SO ENDS this first of two weekends thinking about what is behind the incredible diversity of flower forms. The comparative anatomy of flowers, which would fill volumes, only makes sense when considered from both an evolutionary and a developmental perspective, and fortunately, the genetics behind flower shape have been greatly illuminating, and surprisingly simple at its base. View in LinkedIn

Europe plans ban on plastic cutlery, straws and more http://money.cnn.com/2018/05/28/news/europe-plastic-ban-proposal/index.html View in LinkedIn

SPORULATION PERIODS. "They also impose modulation of gene expression to a minimalist “maintenance” mode and the accumulation of polysaccharide and lipid storage products for use during germination and the resumption of mitosis when conditions improve." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

"SPORULATION PROGRAMS typically entail the assembly of a novel cell wall that preserves viability in the face of noxious environmental circumstances such as high temperature, freezing, desiccation, predation, and exposure to ionizing radiation." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

HAPLOID SPORES. "It is plausible to propose that the protoeukaryote possessed a genetic program for haploid spore differentiation that was independent of any sexual process." https://lnkd.in/ebVhXPf View in LinkedIn

SPORE FORMATION. "At some point during the evolution of protoeukaryotes, there evolved an additional and far more immediate and tangible benefit to transitions from the haploid to the diploid state, namely, restricting the formation of a resting spore to diploid cells, a capability that came to be controlled by mating type." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

BACKUP COPIES. "The selective advantage of diploidy lies in the presence of at least two copies of each gene, allowing complementation of recessive lethal mutations and the potential generation of novel alleles/genes in the second copy." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn