Sofiya (sophiya) wrote,

Интересный факт о репродуктивной стратегии кенгуру

Интересный факт о кенгуру и других сумчатых. У них может быть одновременно "замерший" эмбрион, малыш новорожденный, и малыш, всё еще зависящий от материнского молока. Вот как природа позаботилась о продолжении рода кенгуру! После оплодотворения яйцеклетки образуется эмбрион, развитие которого при неблагоприятных обстоятельствах откладывается... Просто фантастически!

Most marsupials give birth to under developed young that migrate to the pouch to complete their development. In some marsupials such as the kangaroo, copulation can produce a fertilised egg that replicates (by mitosis) to form a group of undifferentiated cells called a blastocyst. At this stage, the blastocyst implants and commences development into an embryo. In unfavourable environmental conditions, some marsupials delay this implantation and this is referred to as diapause. Some kangaroos can, at any one time, have an embryo in diapause, a newborn joey and an older joey all dependent on the mother for nutrition, development and survival.
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