La diversidad genética es esencial para la supervivencia de una especie. Es bastante fácil de mantener si una especie se reproduce sexualmente: un óvulo y un espermatozoide combinan material genético de dos criaturas en uno, formando una descendencia genómicamente robusta con dos versiones distintas del genoma de la especie. Sin esa combinación de diferentes configuraciones genéticas, las especies que se reproducen asexualmente suelen sufrir una falta de diversidad que puede condenarlas a una existencion https://dx.doi.org/10.1038/s41559-024-02
For over a century, the paradigm has been that sex invariably increases genetic variation, despite many renowned biologists asserting that sex decreases most genetic variation. Sex is usually perceived as the source of additive genetic variance that drives eukaryotic evolution vis-à-vis adaptation and Fisher's fundamental theorem. However, evidence for sex decreasing genetic variation appears in ecology, paleontology, population genetics, and cancer biology. The common thread among many of these disciplines is that sex acts like a coarse filter, weeding out major changes, such as chromosomal rearrangements (that are almost always deleterious), but letting minor variation, such as changes at the nucleotide or gene level (that are often neutral), flow through the sexual sieve. Sex acts as a constraint on genomic and epigenetic variation, thereby limiting adaptive evolution. The diverse reasons for sex reducing genetic variation (especially at the genome level) and slowing down evolution may provide a sufficient benefit to offset the famed costs of sex.
#1 Es de 2010. No había , ni he oído nada parecido.
Parece que la reproducción sexual, a la vista de lo que hay actualmente, ha sido la seleccionada en la inmensa mayoría de las especies animales, incluso vegetales creo.
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For over a century, the paradigm has been that sex invariably increases genetic variation, despite many renowned biologists asserting that sex decreases most genetic variation. Sex is usually perceived as the source of additive genetic variance that drives eukaryotic evolution vis-à-vis adaptation and Fisher's fundamental theorem. However, evidence for sex decreasing genetic variation appears in ecology, paleontology, population genetics, and cancer biology. The common thread among many of these disciplines is that sex acts like a coarse filter, weeding out major changes, such as chromosomal rearrangements (that are almost always deleterious), but letting minor variation, such as changes at the nucleotide or gene level (that are often neutral), flow through the sexual sieve. Sex acts as a constraint on genomic and epigenetic variation, thereby limiting adaptive evolution. The diverse reasons for sex reducing genetic variation (especially at the genome level) and slowing down evolution may provide a sufficient benefit to offset the famed costs of sex.
https://onlinelibrary.wiley.com/doi/full/10.1111/j.1558-5646.2010.01173.x
#0 échale un vistazo a este paper
#1 Es de 2010. No había , ni he oído nada parecido.
Parece que la reproducción sexual, a la vista de lo que hay actualmente, ha sido la seleccionada en la inmensa mayoría de las especies animales, incluso vegetales creo.
Que le pregunten a las bacterias al respecto.
#0 Con l cantidad de cosas que envían al
Ciencia que son “”ciencia””
Ahí va mi voto. Muy interesante, gracias!
#2 Ja sido un error. Lo he enviado desde el sub de cultura y no he podido cambiarlo luego. Pero bueno divulgación.