BI-357

Genes and alleles

Biology · Secondary 3 · Medium · Genes and alleles

The ABO blood group in humans is controlled by one gene with three forms:

I^A

,

I^B

and i. Which statement correctly distinguishes the gene from its alleles?

The blood group gene has three alleles: $I^A$ , $I^B$ and i.
$I^A$ , $I^B$ and i are three different genes on different chromosomes.
Each allele is made of many different genes for blood.
The gene is one allele, and the other two are chromosomes.

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