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Multiple Allele Crosses - ABO Blood Groups

AQA A-level BiologyGenetics and VariationLesson 40 of 41

Crosses involving the ABO blood group gene use the same method as any monohybrid cross. Remember: I^A and I^B are codominant, and both are dominant to I^O.

Cross 1: heterozygous group A × heterozygous group B
Parents: I^AI^O × I^BI^O
Gametes: I^A or I^O, and I^B or I^O

	I^B	I^O
I^A	I^AI^B (AB)	I^AI^O (A)
I^O	I^BI^O (B)	I^OI^O (O)

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Key terms in this lesson

heterozygous: Having two different alleles of a particular gene.

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