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Differences in genetic material between dizygotic twins and siblings are likely to be very similar. Dizygotic twins, or so-called fraternal twins, on the other hand, are no more genetically similar than any other set of siblings. - Utah.edu Since all oocytes are all synthesized during fetal development, dizygotic twins are no more likely to come from ...


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When females are in their mother's womb all their Oogenium (plural Oogenia) are being made, they they undergo mitotic divisions to become a primary oocyte. Then, the primary oocytes start to undergo meiosis I - but meiosis I is arrested. This is the first meiotic arrest. When does meiosis I continues? when a female hits puberty, every month one or more ...


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Meiosis consists of two divisions. Both are somehow similar to "ordinary" type of cell division - mitosis, but there is no DNA replication between them. As mitosis, each of two meiosis divisions might be divided into 5 stages: Profaze (condensation of chromosomes, formation of microtubular spindle apparatus between two centrosomes) Prometaphase (the ...


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@Dhurba Benerjee I'm answering your question to my comment here because I need to include a diagram. As I said before ovum at the time of ovulation is arrested at the metaphase (M phase in cell cycle) 2nd meiotic division. This arrest is caused by the presence of two types of cytoplasmic activity 1. MPF - maturation promoting factor 2. CSF - Cytostatic ...


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Graafian follicle. The secondary oocyte and thus Graafian follicle are arrested in the second metaphase of oogenesis. After this the corpus luteum develops from the follicle during the luteal phase of the menstrual cycle.


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I seem to understand the thing now. The video is utterly simplified for animal cell meiosis I and II. In oogenesis, you get after every anaphase one cell with very little cytoplasm, polar body, and another cell with much cytoplasm. In the video, the amount of cytoplasm is equal so the thing is idealized. The video is better to explain male gametogenesis: ...



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