Category: Uncategorized

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

PURGING AND UNMASKING. "That said, haploid meiotic products have the advantage of allowing the “purging” of deleterious alleles and the “unmasking” of potentially adaptive recessive alleles, both clear benefits of the modern version of meiosis." https://lnkd.in/ebVhXPf View in LinkedIn

FALSE PREMISE. "There is no basis to the claim that the original meiotic products were haploid, other than the parsimony argument that because they are so now then they may also have been so when they originated." https://lnkd.in/ebVhXPf View in LinkedIn

PLOIDY TRANSITION. "It is worth noting explicitly that original versions of meiosis may have taken tetraploids to diploids rather than diploids to haploids, or octoploids to tetraploids for that matter because the key metric is ploidy transition rather than absolute ploidy level." https://lnkd.in/ebVhXPf View in LinkedIn

UNIQUE FEATURE. "For this to succeed, mechanisms promoting sister chromatid cohesion were required. The unique feature of meiosis compared with mitosis is meiosis I in which chromosome homologs rather than sister chromatids segregate in a reductional division." https://lnkd.in/ebVhXPf 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

ORIGINS OF SEX. "Any heterotypic recognition/adhesion pairs (hereafter H1/H2) in a protoeukaryote would be candidates for the next posited stage in the origins of sex, namely, the exclusive expression of H1 in gametes that we will generically call plus mating type and exclusive expression of H2 in gametes that we will call minus mating type.' http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

SELF RECOGNITION MOLECULES. "The original self-recognition molecules in protoeukaryotic gametes might have engaged in homotypic interactions, like present-day cadherins that adhere to one another. Alternatively, the interactions might have been heterotypic, like present-day integrins that adhere to intercellular adhesion molecules (ICAMs)." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn

VAST PERIANTH DIVERSITY. "Within the angiosperms, other morphological features could be explained by homeosis, primarily in the sterile floral organs, collectively termed the perianth. These organs show enormous diversity in their morphology." https://lnkd.in/dVXk7jP View in LinkedIn

BREAKING THE SPECIES BARRIER. "That said, there are examples in which hybrids that have formed from cross-species cell–cell fusions have ultimately given rise to new species, such as the posited origin of S. cerevisiae from an ancestral whole genome duplication event following fusion of two related, but different, yeast species." http://cshperspectives.cshlp.org/content/6/3/a016154.full View in LinkedIn