This resource appears to be designed to build towards this science and engineering practice, though the resource developer has not explicitly stated so.
Comments about Including the Science and Engineering Practice
This uses a model to explain the phenomena but does not develop the model. The educator needs to address both meiosis and fertilization. This lesson uses a model of genes on chromosomes and how variety in genes leads to different traits in an individual. The lesson is important in student understanding of the facts that every organism inherits a unique combination of traits, DNA is a set of instructions that specifies the traits of an organism, information in the DNA molecule is divided into segments (called genes), and variations in the DNA lead to the inheritance of different traits.