The AP Biology students reviewed (at least I hope it was a review) sex-linkage. Sex-linked traits are traits that are attached or found on the X chromosome. Traits like color-blindness, hemophilia and Duchenne muscular dystrophy are all sex-linked disorders and, as such, are found most often in males.
The Biology students learned how pedigrees worked to track genetic traits within a family. The students have an assignment: put together their own pedigree and ask as many people as possible on that pedigree the following question - do you have hair on the mid-digit of your fingers? Hopefully, the people the students ask won't hang up on them.
The Chemistry students made gold (brass) pennies for the last (maybe) time today.