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Autogamy - Patterns of Sexual Reproduction
It is known to take place in many ciliate protozoans including Paramecium. Autogamy involves same nuclear behavior like in conjugation, but it occurs in a single individuals. Hence, there is no exchange of micro-nuclear material among two individuals, as only a single individual is involved.
Figure: Autogamy in Paramecium. The macronucleus degenerates and micronucleus undergoes meiosis to form 8 or more nuclei (1) Two of these nuclei fuse together to form a zygate nucleus (2) The others degenerate. The synkaryon divides to form a new micronucleus and macronucleus (3).
How many chambers do the bird heart and the mammalian heart have? Concerning temperature maintenance what is the advantage of the double and complete circulation of these animals?
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phylum porifera
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