Students pair up in order to exchange genet- ic material for their offspring. First they pick a card color (gene). Both "parents" lay their cards of that color on the table, face down. Randomly select a card from each partner. (These cards represent the alleles that will be passed on to the offspring.) Before the cards are placed in the Offspring pile, one of the part- ners rolls a single die. If the roll is not 6, the cards are placed on the Offspring pile and play continues with the next color of cards. If the roll is a 6, then a muta- tion has occurred and the "parents" must make a selection from the Mutation Cards for that color; this mutation will be passed on as a dominant trait to suc- ceeding generations. (The Mutation Cards we use are included on the Master Sheets. We included both the Startup Cards and the Mutation Cards for a particular gene on one sheet for easy color-coded photocopying.)