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I am type AB, my husband is type O, my son is type A and my daughter is type B. Why are the blood types of the two children still different?
This is determined by recessive genes and dominant genes in biological inheritance, with A and B being dominant and O being recessive.

Dominant gene means that as long as one of the genes is dominant, it is dominant; Recessive gene means that both genes are expressed when they are invisible, otherwise they are dominant genes.

For example, a person's blood type is composed of A, B and I, A and B are dominant, I is invisible, you are AB, and your husband is ii(ii is type O blood). Your child will be arranged and combined by AB and ii (that is, you and your husband each have one gene), so your child's possible genes are: Ai (that is, blood type A), Bi (that is, blood type B), Bi.

Arrangement and combination mode

Pure hand tour, hope to adopt.