பாலியல் செல்களில் ஒன்று, மற்றும் உடல் செல்களில் இரண்டு தொகுப்பு குரோமோசோம்கள் உள்ளன.
Excerpt of 1906 letter from W. Spillman to the American Breeders Association. The letter summarizes "recent" discoveries in genetics. Boxed text talks about meiosis in relation to Mendel's law of segregation.
A picture of a sperm fertilizing an egg.
Visual by www.PDImages.com.
A signed portrait of Theodor Boveri.
Theodor Boveri.
Human female karyotype.
Gametes are usually smaller than the organisms that make them. However, at 2 mm, fruit fly sperm is as long as the fly itself and 300 times longer than human sperm. Another species of fly, Drosophila bifurca, makes sperm that are 6 cm long, 20 times larger than the flies.
Only one sperm is needed to fertilize one egg, however, the sperm to egg ratio is usually thousands or even millions to one. Why do you think this is the case?
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Excerpt of 1906 letter from W. Spillman to the American Breeders Association. The letter summarizes "recent" discoveries in genetics. Boxed text talks about meiosis in relation to Mendel's law of segregation.