“The egg of every species of animal or plant carries a definite number of bodies called chromosomes. The sperm carries the same number. Consequently, when the sperm unites with the egg, the fertilized egg will contain the double number of chromosomes.”
Other Thomas Hunt Morgan Quotes
Two years work wasted, I have been breeding those flies for all that time and I've got nothing out of it.
Thomas Hunt Morgan 
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For each chromosome contributed by the sperm there is a corresponding chromosome contributed by the egg, there are two chromosomes of each kind, which together constitute a pair.
Thomas Hunt Morgan
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One of the most amazing developments in the history of biology.
Thomas Hunt Morgan
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