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Мейоз

QuestionAnswer
Мейоз это два следующих друг за другом деления клетки, которые лежат в основе образования гамет
Профаза I занимает 90% времени. Происходит скручивание молекул ДНК и образование хромосом. Растворяется ядерная оболочка. Разрушаются ядрышки. Формируется веретено деления.
конъюгация соединение гомологичных хромосом с образованием структур
кроссинговер обмен участками между гомологичными хромосомами.
Метафаза I Разрушается ядерная мембрана и профаза сменяется метафазой. Исчезают ядрышки. Биваленты располагаются в экваториальной плоскости клетки, образуя метафазную пластинку. Хромосомы сильно спирализованы – утолщены и укорочен
Анафаза I Расходятся хромосомы, состоящие из двух хроматид, прикрепленных к одной центромере. Происходит редукция центромер.
Телофаза I Образование ядерной мембраны и восстановление структуры ядра
Created by: sembaeva
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