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Which of these are the correct base pairs in DNA ?

thymine and guanine

cytosine and guanine

cytosine and adenine

adenine and uracil

Cattle with brown fur and cattle with white fur will produce a reddish roan calf . when examined closely, the calf show about an even number of brown hairs and white hairs that give a reddish appearance when viewed from far away. the fact that both the brown fur allele and the white fur allele are expressed equally in the offspring is an example of