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Unit 3: Punnett Squares and Inheritance Patterns

Unit 3: Punnett Squares and Inheritance Patterns

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Objectives and Instructions

Lesson Objective:

Considering inheritance patterns of autosomal dominant and autosomal recessive disorders, the learner will be able to predict the likelihood of an offspring inheriting the disorder by analyzing parental alleles. 


Please watch the video tutorial to learn about the basics of Punnett squares. Using that information complete the practice problems below the video and score yourself using the key provided to check your understanding of the concepts. When you feel confident in your understanding of the concepts, complete the 5 quiz questions in the upper right corner of this page. 


Besides just physical traits like hairline or eye color, other traits such as disorders or diseases can be passed from parents to offspring. Did you know that colorblindness is a genetic disorder passed from parents to offspring and that males are more likely to be colorblind than females? But why? Red-Green color-blindess is the most common form of colorblindness. Look at the image below, if you were colorblind you would not be able to read the number within the circle. The way in which genetic disorders are inherited can vary depending on if the disorder is a dominant or recessive disorder and whether the disorder is inherited on sex chromosomes or autosomes. See the video tutorial for more information on how genetic disorders can be inherited and how we can use that information to predict patterns of inheritance. 


Video Instruction

Practice Problems