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.

Thomas Hunt Morgan

Animal Bodies Carries Consequently Contain Definite Double Egg Every Number Plant Same Species Sperm Unites Will

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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.

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These protected areas are not only important for the conservation of species they contain, they also hold the key to comparing our own development as a species with our next of kin.

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