
For example, humans are genetically similar to apes. Phylogenetics can also help scientists unveil as to which organism is evolved from which. Let us now look into the depths of inter species breeding. First let's start off with reproduction at the cellular level. A multicellular organism is derived from a single gamete fusing with another to form a genetic mixture called a zygote. A zygote keeps on dividing into millions of cells which are all genetically identical. This process only occurs when both the parents of the offspring are of the same species. If however, parents are of different species the resulting offspring is termed as either a hybrid or a chimera. A well known example of a hybrid is the mule, whose parents are donkey and horse. These hybrids are either produced naturally or with human interference. Hybrids are genetically identical to their parents containing a mixture of genes from both the parents. The example of a chimera is that of a geep, which is derived from a sheep embryo and a goat. The difference between a hybrid and a chimera is that chimera are not a genetic mixture of their parents. Half of their parts look like a sheep, while the other like a goat! So the new definition that scientists now have of the species is that a specie will be a part of a particular group of specie if it can reproduce with the other in the group. So mule, a hybrid, is not part of any specie since it cannot reproduce. Since the horse has 64 chromosomes and a donkey 62, so problem occurs in meiosis. They are also termed as being in reproductive isolation. So all those females can now stop fantisizing about vampires and werewolves, and now you know why!;)
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