Lab Activity Blood Type Pedigree Mystery Free Jun 2026

A parent with Type AB blood cannot have a Type O child.

“Easy,” said Leo. “If Ana and Carlos are both type A, they can’t have a type O child unless they’re both heterozygous AO.” lab activity blood type pedigree mystery

In most versions of this activity, the mystery is solved by uncovering a hidden family truth: A parent with Type AB blood cannot have a Type O child

This lab is a staple in high school biology for three reasons: provided the parents are heterozygous.

The Punnett square analysis confirms that if both parents are heterozygous ($I^A i$ and $I^B i$), there is a 25% probability of them producing a Type O child. Therefore, for Claimant X to be the biological son of Mr. and Mrs. Rich, provided the parents are heterozygous.