Aparent with blood type a and a parent with blood type b have children with blood type a, b and ab what type of inhertiance pattern is shown by the child with type ab blood and why?

The type of inhertiance pattern shown by the child with type AB blood is called INCOMPLETE DOMINANCE.

Explanation:

INCOMPLETE DOMINANCE is the ability of two contrasting alleles to interact and produce a heterozygous phenotype that is different from the two homozygous phenotype.

According to the principles of Mendel, genes are either dominant or recessive; the dominant expressing itself in homozygous or heterozygous state. i.e., the children should have all with blood type A or type B.

But in the case being discussed, a child with AB does not agree with Mendel's principles all because neither blood type A nor type B is fully dominant over the other, hence, type AB, a different phenotype would emerge

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.