Agene for the mn blood group has codominant alleles m and n. if both children are of blood type m, which of the following is possible? both children are heterozygous for this gene. each parent must be type m. each parent is either m or mn. neither parent can have the n allele.

The correct answer would be "Each parent is either M or MN".  

Co-dominance is the condition in which both the alleles express themselves completely when present in the heterozygous condition.

The blood group of the offspring can be of M type in two conditions:

1. When both the parents are of M blood group  

2. When both the parents are heterozygous for the blood group that is, they both are MN.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )