What are alleles in blood type?
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genes which code for a pair of contrasting traites are called alles
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There are three versions (called “alleles”) of this gene: A, B, and O. A person's blood type is determined by which allele he/she inherits from each parent. You can see that the A and B genes are “co-dominant”. In other words, if both an A and B allele are inherited, both are expressed.
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