## Blood Types Problem Set

### Problem 2: Possible blood types of offspring.

#### Help to answer the question

 What if the mother is type O+ and the father is A-? What would the offspring's blood type be? --Mark

## Tutorial

Inheritance
 Both the ABO blood type alleles and the Rh factor genetic information are inherited from our parents, but they are inherited separately.

Blood types
 The mother of the child is blood type 0. We know that she is homozygous. The father could be homozygous with two alleles of type A or he may be heterozygous with one allele of type A and one allele of type O. If the father is heterozygous, there is a 50% probability for a blood type A child and a 50% probability for a blood type O child. If the father is homozygous, every offspring will be blood type A.
 Mother'sPossibleGenotype Father'sPossibleGenotypes Child'sPossibleGenotypes OO AA AO OO AO AO, OO

Rh factor
 The mother of the child is Rh+. She may be homozygous or she may be heterozygous with one Rh+ allele and one Rh- allele. If the mother is heterozygous, because the father is Rh-, there is a 50% probability for an Rh+ child and a 50% probability for an Rh- child. If the mother is homozygous, every offspring will be Rh+.
 Mother'sPossibleRh factor Father'sPossibleRh factor Child'sPossibleRh factor Rh+Rh+ Rh-Rh- Rh+Rh-, Rh+Rh- Rh+Rh- Rh-Rh- Rh+Rh-, Rh-Rh-

The Biology Project
Department of Biochemistry and Molecular Biophysics
University of Arizona
Thursday, October 23, 1997
Contact the Development Team

http://www.biology.arizona.edu