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God makes like bring forth like. This is echoed not only in the Levitical laws given later, which forbid mixing types of seeds or breeds of animals, and even weaving cloths of two types together. It makes practical sense, because hybrids tend to be sterile under most conditions. It also shows that even when people reproduce, they tend to create those like themselves, hence the curse upon the lineage of Canaan [Hamites], and the blessings upon the descendants of Abraham. As children of God, we are created in his image, to be like Him, and to bring forth future generations to be like Him.