Last time the kids worked on dissections. I did a quick Punnet square quiz with an unusual cross. Sophie's parents are A- and B-. They have at least one child who is type O-. I had the girls figure out the parents' likely genotypes, the correct Punnett square, and percent phenotypes of their children. Mom is Boii and Dad is Aoii. The children have a 1/4 chance for Aoii, Boii, ABii, or oil, A-, B-, AB- and O-. The family has nine children. Mom is sure that two ate O-, two are A-, and at least one is AB-. Cool right? I use real situations whenever possible to help kids understand blood types. It does creep the girls out when I use examples such as my husband's and my blood types and kids' blood types for a dihybrid cross. I encourage you to use the Eldon cards to derive the blood types and talk about your family's genotype when you do Punnett Squares. This link has good information about blood type genetics.
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