Illustrated Articles
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There are multiple methods of inheritance that determine which characteristics (or phenotypes) are displayed by the offspring, including autosomal dominant, autosomal recessive, and sex-linked inheritance. There are also many polygenic traits (i.e., associated with multiple genes) as well as environmental factors that make it much more complicated to predict disease or the likelihood of passing disease onto offspring.
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Deoxyribonucleic acid (DNA) is a long molecule that contains an organism’s entire genetic code. Every cell in the body contains two identical strands of DNA, and this DNA contains the “instructions” (genes) needed to create and run every part of the body. This handout summarizes how DNA works and how it directs the overall appearance, health, and actions of an animal.
