Question

urse Home Practice Problem 15 Part B fucosyl transferase, an enzyme that helps produce the H subistaince. Which Expression of the A and B antigens on red blood cells is influenced by the FUT1 gene. This gene enoodes of the following statements about the H substance is incorrect? s a substrate for the enzymes produced by the M and genes. These enzymes ad the appropriate torminal sugar to the H subatance and B antigens, respectively O Individuals that are heterozygous for the FUT! gene cannot produce the H substanoe OIndividuals that fail to produce the H substance are said to have the Bombay phenotype O Individuals that cannot produce the H substance appear to be type O even if they harve functional and/or aleles Submit
Is the correct answer the first or second one?

Answer 1

Answer: Individuals that are heterozygous for the FUT1 gene cannot produce the H substrate.

(Because the H substance is a substrate for the enzymes produced by antigen and antibody and these enzymes add the appropriate terminal sugar to the H substance producing the A and B antigen)