Question

what are alleles A.the decoders of the DNA message B.two forms of single genes C.the basic unit of inheritance D.a measurable factor.

Answer 1

Hey there!

Your answer is option B.

Alleles are two forms of single genes.

Hope this helps you.
Have a great day (:

Answer 2

B describes what an allele is correctly. An allele is a variation of a gene, like said by the second option.

Answer:

$\boxed{\bf~The~second~ooption~is~correct.}$

Hope it helped,

Happy homework/ study/ exam!