Month: September 2022

STABLE DIOECY. "Overall, therefore, a co-sexual population can, under suitable conditions, evolve dioecy; when dioecy is reached, the females will carry the initial male-sterility mutation, while the males carry one or more male-promoting mutations." https://lnkd.in/exrSaeb View in LinkedIn

SUPPRESSED RECOMBINATION. "It is easily seen that suppressed recombination between X and Y chromosomes must have evolved to prevent the sex-determining genes recombining, and the two-mutation model for evolution of dioecy provides a reason why such recombination is disadvantageous." https://lnkd.in/exrSaeb View in LinkedIn

RESOURCE COMPETITION. "If the male-promoting mutations also reduce female fertility, they are also female-sterility mutations. Such ‘trade-offs’ between male and female functions may often arise, for example if an allele increasing resources devoted to male functions reduces those available for female functions; thus alleles of some genes cannot simultaneously be best in both sexes." https://lnkd.in/exrSaeb View in LinkedIn

MUTATION INVASION. "Such trade-offs are central to models explaining the maintenance of hermaphroditism against invasion by mutations that lead to separate sexed individuals." https://lnkd.in/exrSaeb View in LinkedIn

Interstellar object confirmed to be from another solar system https://www.theguardian.com/science/across-the-universe/2017/nov/20/interstellar-object-confirmed-to-be-from-another-solar-system?CMP=Share_iOSApp_Other View in LinkedIn

DISRUPTIVE GENES. "A gene can take control of sex development, and can sometimes replace an established system." https://lnkd.in/exrSaeb View in LinkedIn

RECOMBINATION SUPPRESSED. “Given that the sex-determining loci of many animals, as well as a wide diversity of plants, are in non-recombining genome regions, it seems more likely that these genome regions initially recombined, and that selection has acted to suppress recombination." https://lnkd.in/exrSaeb View in LinkedIn

SUPPRESSION. "Recombination suppression may involve inversions, for instance in mammals. Other kinds of chromosomal rearrangements, including translocations, can also suppress recombination. Translocations involving sex chromosomes are known in several species, and could be advantageous because they cause linkage between autosomal and sex-linked genes." https://lnkd.in/exrSaeb View in LinkedIn

A TYPE OF FREEDOM. "The evolution of separate sexes from an initially co-sexual state might be expected to provoke evolutionary changes, as each sex adapts to the release of constraints imposed by the other sex function." https://lnkd.in/exrSaeb View in LinkedIn

MAJOR UPHEAVALS. "Comparisons of the sex chromosomes of the three major mammal groups show that there were two upheavals of sex chromosomes during mammal evolution." https://lnkd.in/ehjz378 View in LinkedIn