What blood type will a child have if both parents have type A blood?

Nov 14, 2024 Source: Cainiu Health

Dr. Liu Feng

Introduction

Under normal circumstances, if both parents have blood type A, their child can have either blood type A or O. When both parents are AA homozygotes, the child can only have blood type A. Only when both parents are AO heterozygotes can the child have blood type O. If there is any doubt about blood type, it is recommended to undergo blood type testing at a正规 hospital to obtain the most accurate result.

Generally, if both parents have blood type A, their child can have either blood type A or O. The detailed explanation is as follows:

Blood type A has two possible genotypes: AA (homozygous) and AO (heterozygous). When both parents are homozygous AA, the child will definitely have blood type A. When one parent is homozygous AA and the other is heterozygous AO, there is a 50% chance the child will be AA and a 50% chance of being AO; however, in both cases, the child's blood type will be A.

Only when both parents are heterozygous AO can the child possibly have blood type O. In such a case, there is a 25% chance the child will be homozygous AA, a 50% chance of being heterozygous AO—both resulting in blood type A—and a 25% chance of being OO, which results in blood type O.

Blood type inheritance is not absolute. Rare situations such as gene mutations may lead to a child's blood type differing from that expected based on parental types, although such cases are extremely uncommon. If there are any doubts about blood type, it is recommended to undergo blood typing at a reputable medical institution to obtain the most accurate results.

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