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Plant meiosis gives rise to four megaspores but usually upto three of them die by apoptosis leaving only one megaspore. But they are symmetric and three of them need not die all the time as it seems [REF]. Plasmodium being a haploid organism undergoes meiosis after fusion of gametocytes. Sexual differentiation is initiated at some point during the merozoite ...


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I'm not sure about the ubiquity of this but, in many animals, each each primary oocyte that undergoes oogenesis only produces one mature egg. The other products of meiosis are polar bodies, which are not fertilised. These cells often degenerate but can sometimes play supportive roles in embryogenesis. To answer your question, each mature egg is ...


3

While your question asking about birds, reptiles and fish (oh my!) may be too broad, hopefully looking at frog oogenesis can show some differences in large offspring number v. small offspring number. Some frogs even give birth to live offspring (Iskandar et al. 2014). Much of this explanation can be found in Developmental Biology, 6th edition by Gilbert ...



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