Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 15 - 15.4 - Concept Check - Page 309: 2


You cannot tell. The child could have two copies of the A allele ($I^{A}$ for genotype $I^{A}$$I^{A}i$) from the father or two copies of the O allele (i for genotype $I^{A}ii$). There is not enough data to distinguish those possibilities.

Work Step by Step

The key here is to think about what blood type means--proteins sticking out of the cell--and that nondisjunction just means an extra copy of a chromosome. Going through the information in the question, you will see nothing to point to one particular non-disjunction event. This is especially true since non-disjunction can occur in meiosis I or II. If it were only the former which were possible, then the mother would have to be the cause since the child would otherwise be AB.
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