Year: 2022

CONTINGENT IRREVERSIBILITY EXAMPLE 6. "The reversion from sex to parthenogenesis. Gymnosperms are also never parthenogens, perhaps for a different reason: chloroplasts are transmitted in the pollen." https://lnkd.in/eZ5-m7K View in LinkedIn

CONTINGENT IRREVERSIBILITY EXAMPLE 7. "The reversion from sex to parthenogenesis. Amniote vertebrates, although they may be parthenogens, always require sperm from males of another species to initiate development, perhaps because the sperm provides a centriole." https://lnkd.in/eZ5-m7K View in LinkedIn

CENTRAL CONTROL. "If a 'selfish' mutation occurs in a chromosomal gene, a suppressor mutation at any other locus in the genome would be favoured by selection. Hence the rest of the genome may win the contest, not because of any analogue of majority voting, but because of the large number of loci, and hence of possible suppressor mutations, that are available for each selfish mutation." https://lnkd.in/eZ5-m7K View in LinkedIn

THE DIVISION OF LABOUR EXAMPLES. "Caste differentiation in the social insects." https://lnkd.in/eZ5-m7K View in LinkedIn

THE DIVISION OF LABOUR EXAMPLES. "The specific name, Volvox weissmania is a reminder that these algae are an excellent example of the segregation of the germ line and soma. Most members of the order possess only a single cell type, which fulfills all vegetative and reproductive functions." https://lnkd.in/eZ5-m7K View in LinkedIn

THE DIVISION OF LABOUR EXAMPLES. "In Pleodorina, there is a partial division of labour: some cells start with vegetative functions, but later differentiate into gonidia (asexual propagules)." https://lnkd.in/eZ5-m7K View in LinkedIn

THE DIVISION OF LABOUR EXAMPLES. "The evolution of many specific enzymes from a set of multifunctional, low-efficiency enzymes. If the first protocells were equipped with a few multifunctional enzymes, more efficient enzymes could evolve only by duplication and divergence." https://lnkd.in/eZ5-m7K View in LinkedIn

THE DIVISION OF LABOUR EXAMPLES. "In the RNA world, RNA served as both genetic material and catalyst: today, DNA is the genetic material, and most enzymes are proteins." https://lnkd.in/eZ5-m7K View in LinkedIn

THE DIVISION OF LABOUR EXAMPLES. "In prokaryotes there is a single cell compartment, whereas in eukaryotes the genetic nucleus and metabolic cytoplasm are separated, and additional organelles have evolved, some recruited symbiotically." https://lnkd.in/eZ5-m7K View in LinkedIn

THE DIVISION OF LABOUR EXAMPLES. "In sexual populations isogamy has repeatedly evolved to anisogamy, with differentiated sperm and ova." https://lnkd.in/eZ5-m7K View in LinkedIn