This resource is explicitly designed to build towards this disciplinary core idea.
Comments about Including the Disciplinary Core Idea
Students are observing the baby guppies to see the traits that they have inherited from their parents. Coloration is the most obvious, but students may observe many other traits such as size, tail shape, body shape. To reinforce the idea of fry inheriting traits from their parents, the teacher could project pictures of all of the male guppies on the LCD for the students to carefully observe. Then, the teacher could add a picture of one of the male fry to the screen. Ask the students to try to identify the father of the baby guppy. Discuss clues that might lead to solving the puzzle of who might be the father. Guide the students to observe markings, colors, and tail and body shape during this exercise. Note: Because female guppies are quite plain, using the brightly colored and patterned males will make this activity easier.