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ashleeritchie
Feb 18, 2012, 08:13 AM
Can a parent with O blood and parent with O- blood have a child with A blood?
DrBill100
Feb 18, 2012, 08:42 AM
Below is an easy-to-read chart that allows you to cross reference parental blood types for heritability:

ABO Chart - Parents & Child (http://www.canadiancrc.com/Paternity_determination_blood_type.aspx)

As you will note, two O blood type parents can produce a child with only O blood type.