Unformatted text preview: cell they swim about and may meet other individuals and fuse in pairs to form a zygote. The zygote eventually rounds off, withdraws the flagella, secretes a thick wall round the cytotoplasm so forming a zygospore which sinks to the bottom of the pond. In this form it may be resistant to extremes of temperature and survive even the drying up of the pond. As a zygospore, too, it may be distributed in dust or mud, and so reach new situations. The cytoplasm in the zygospore will divide, usually into four units, which are released as new chlamydomonas individuals 1 2 3 (a) gametes meet (b) gametes fuse (c) nuclei fuse (d) flagella withdrawn zygote rounds off (e) zygote secretes thick wall to become zygospore Sexual reproduction © D.G. Mackean...
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- Fall '11