Reproduction

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EGGS AND SPERM.
1. Conjugation the Starting Point. There have been no differences in the gametes or mating bodies in those species we have studied. The ciliated gametes of Ulothrix are of the same size and structure. The mating cells of Spirogyra are apparently alike. The paramecia that unite are as nearly alike as it is possible for organisms to be.
Indeed, we call the process conjugation only when the • gametes are alike, so far as we can perceive. This condition must be looked upon as the si
...mplest kind of union of offspring. It seems to be the beginning of a process which is very common in both plants and animals.
This we must now study.
2. Beginning of Differences in Gametes. Pandorina is a simple green plant made up, when mature, of sixteen cells held together by a jelly which they have secreted.
It is not a plant you are likely to see, but it is described in both botanies and zoologies, because it is hard to say whether it is more like plants or animals. It starts as a single cell.


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