What indicates the biological sex of each individual on the pedigree?

the shape of the symbol

Explanation:

See the picture attached. In family pedigrees, the shape of the symbols represent biological sex. The circles represent females and squares represent males.

The individuals with the trait or disease usually have their symbol shaded. So an affected female would have a shaded circle, and an unaffected male would have a white square.

the answer is d.) homologous; have mammary glands

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