Overview
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We can learn a lot about a genetic condition from a pedigree of a family. The first two considerations, of course, are which kind of chromosome the gene is on (autosomal or X-linked) and whether the condition is caused by a dominant or recessive allele. As you watch this video, try to interpret each pedigree before Lawlor says the answer.
We can also learn about why a family might have an unusual number of kids with the condition. For example, close cousins could marry. Be sure you understand why that can increase the number of offspring with a recessive trait.
1. What is the term Lawlor gives for the situation where close cousins produce offspring?
2. What unusual thing does Lawlor do while presenting this concept?