Which expression shows the sum 9 + 21 rewritten as a product of the gcf and a sum?

Step-by-step explanation:

the sum 9 + 21 rewritten as a product of the GCF and a sum

to find GCF, we look at the factors of 9 and 21

9 can be written as

21 can be written as  

For 9 and 21 the common factor is 3. So GCF is 3

So , the sum 9 + 21 rewritten as a product of the GCF and a sum is

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).