Пофлудим о Гуппи

[Юрий Сахаров]

Допис від ОгнеЛо

можно получить т.н. суперсамцов с генотипом YY.

Это теория, или есть такие рыбы? Оффтоп

По поводу супер самок полно в наших водоемах таких карасей, их икру оплодотворяют любые карповые рыбы, но У хромосома не растет потом в зародыше, эти самки имеют триплоидный набор хромосом 150, у обычных двуплоидных 100. http://www.ryblib.ru/raznoe-dlya-ryb...lko-samki.html

[ОгнеЛо]

Допис від Юрий Сахаров

Это теория, или есть такие рыбы?

Это — практика.
Почитайте, например,
Highway L., Madewini G., America S. Crossing-over between Y chromosomes: another possible source of phenotypic variability in the guppy, Poecilia reticulata Peters. – 2008. [pdf]
AACL Bioflux, 2008, Volume 1, Issue 1, p. 1—10

Скрытый текст

Аннотация
Genetic linkage acting through crossing-over between X and X chromosomes, X and Y chromosomes, and autosomal gene recombination are the most important sources of color pattern polymorphisms in animals. Variability in male color patterns and fin morphologies in the guppy, Poecilia reticulata, a livebearing fish is an example of extreme pattern polymorphism. We explored the possibility that crossing-over between Y chromosomes can also contribute to the high degree of pattern polymorphism in guppies because YY individuals are easily induced in the boratory. However, note that YY individuals are also produced in natural populations. Our results indicated that YY crossing-over was another important source of phenotypic variability — probably because recombination may be possible ver the entire length of Y chromosomes, and at very high frequencies due to high degrees of homology. Thus, crossing-over between Y chromosomes is yet another mechanism that can contribute to extreme pattern polymorphism in the guppy, a popular aquarium and important research model species

.