In some flowers there are two alleles for a color, and these can both be expressed equally at the same time. which best describes this trait

Two traits are equally expresses when the traits are codominant.  In codomimance, neither trait is dominant nor recessive.  In some flowers, for example, different colors are codominant, and combining the two produces an entirely different color (red x white leads to pink offspring).

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.