A rr-eally Good Example

(I am in a high school biology class. We are learning about Punnett squares.)

Teacher: “You take the Dominant D gene and the Recessive r genes and slide them down the boxes, like this, to get DD Dr Dr rr. So, in a perfect world, out of four kids, parents who both have Dr genes would have one kid that displays the recessive gene.” *looks at [Student #1]* “Like [Student #1]’s freaking family, proving theoretical genealogy. Out of four kids, his parents had three brunette girls and one ginger boy. With how randomized genes can be, it’s utterly amazing his family actually exists.”