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.

they are known to reach a speed of 21 miles per hour

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.