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Hybrids are not a species. They cannot reproduce because the two different species have two different numbers of chromosomes. In biology, a hybrid comes from combining the qualities of two organisms of different breeds, varieties, species, or genera through sexual reproduction. Hybrids cannot reproduce because they are sterile.
Because they do not match, the chromosomes from one species cannot pair during meiosis with the chromosomes from the other species. The mule being a cross breed of a horse and a donkey is an example of a hybrid. The primary reason for hybrid sterility is the incompatibility of the DNA and the difficulty in the pairing of the chromosomes.
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Hybrids are infertile animals which are incapable of producing the sperm cells required to produce the zygote i.e to fertilise the egg cell present in the females. This is because they are formed due to the mating of two completely different species .
Therefore in the chromosomes of the different species no similarity is found . Therefore due to lack of heriditary information and due to genetic disorder they are found to be incapable of mating to produce the young ones.
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