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Description:This contrasts with the typical male karotype of 46,XY; thus, the X and Y chromosomes are known as female and male, respectively. Because humans inherit mitochondrial DNA only from the mother's ovum, genetic studies of the female line tend to focus on mitochondrial DNA. In mature women, the breast is generally more prominent than in most other mammals; this prominence, not necessary for milk production, is probably at least partially the result of sexual selection. In some cases, even if a child had XX chromosomes, if they were born with a penis, they were raised as a male.

Views: 6859 Date: 2019-01-22 Favorited: 74