LS3.B: Variation of Traits

In this video Paul Andersen explains how variation is created in a population over time.  Variation in offspring is caused by genetic recombination, mutations and environmental effects.  Parental DNA is recombined using the process of meiosis.  Mutations can add novel genes to a population and the environment can shape the expression of genes.  A K-12 teaching progression is also included.

ETS1.B: Developing Possible Solutions

In this video Paul Andersen explains how many possible solutions are developed in the design process.  As many solutions to the problem are identified using a brainstorming process.  These solutions are compared to the specific constraints and criteria of the solution.  Models are created to test the viability of each solution.  A K-12 teaching progression is also included.

CCC6: Structure and Function

Paul Andersen explains how the structure of objects are related to their function and vice versa.  He begins with a quick quiz on bicycle construction and ends with a progression of teaching for students grades K-12.  He also explains how the scale of an object will determine the function studied.

SEP2: Developing and Using Models

Paul Andersen explains the importance of modeling in science and engineering.  Models are used by scientists to explain phenomenon.  Unlike mental models, conceptual models can be shared by all scientists to improve our understanding of the Universe.  Engineers use models study systems and test designs.