Cleavage division || Early Embryonic development in Human || Class 12 || NEET || Biology by Sayan
Автор: Biology by Sayan
Загружено: 2023-04-14
Просмотров: 63
Описание:
Cleavage division || Early Embryonic development in Human || Class 12 || NEET || Biology by Sayan.
Definition: The series of cell division by which a single fertilised egg cell is transformed into a multicellular body (morula) is called cleavage. In human, the cleavage is of holoblastic type (blastomeres divide completely).
• Characteristics of cleavage:
i. The daughter cells produced mitotically are genetically similar to the parent cell.
ii. During cleavage, growth does not occur because the G-phase remains absent and the interphase is very short. Cell-cycle only comprise of M-phase and S-phase. The resultant new cells become progressively small in size.
iii. The ratio of nuclear material to cytoplasm increases due to rapid DNA synthesis.
iv. During cleavage there is no cytoplasmic synthesis.
Answers of the respective MCQs:
Q. (i) a
(ii) b
(iii) a
(iv) a
(v) d.
Повторяем попытку...
Доступные форматы для скачивания:
Скачать видео
-
Информация по загрузке:
