Punnett
How can a Punnett Square be used to explain basic genetics?
A Punnett Square (Source: Answers in Genesis)
When studying genetics, the Punnett Square is used to simplify the DNA possibilities. Let’s use the picture to understand skin tones. The capital letters “A,B” represent a person with more melanin (dark skin), and the lower-case letters “a,b” represent having very little melanin (light skin). If a dark-skinned mother (A,B) has a child with a dark-skinned father (A,B), their child will have dark skin (A,A,B,B) because that is the only option in the DNA. If a light-skinned mother (a,b) has a child with a light-skinned father (a,b), then that child will have light skin (a,a,b,b). If you mix it up with a (A,B) mother and a (a,b) father, you have multiple possibilities. In fact, some sets of twins have been born where one is light-skinned and the other is dark-skinned.