Tara and Boris, expectant parents, wonder about the endless possibility of traits their unborn son might inherit from them (e., Tara's red hair and...

Tara and Boris, expectant parents, wonder about the endless possibility of traits their unborn son might inherit from them (e.g., Tara's red hair and allergies; Boris's tall frame and poor eyesight). As a genetics expert, what can you share with them about the number of chromosomal combinations that are possible when a parental cell divides to make an egg or sperm cell?