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Understanding DNA, Chromosomes, and Genes: The Basics of Heredity

This resource provides an insightful look into DNA and chromosomes, comparing DNA to a twisted ladder known as a double helix. Each "step" of the ladder comprises pairs of chemical bases: Adenine pairs with Thymine, while Guanine pairs with Cytosine. Genes are segments of DNA that encode traits and come in pairs, with each variant referred to as an allele. This foundational knowledge is essential for understanding heredity, traits, and genetic variation. For interactive learning, visit our linked educational resources.

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Understanding DNA, Chromosomes, and Genes: The Basics of Heredity

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Presentation Transcript

  1. DNA & Chromosomes

  2. DNA Model • DNA can be compared to a ladder that is twisted into a continuous spiral shape known as a double helix • Each step contains pairs of chemicals • Adenine and Thymine pair together • Guanine and Cytosine pair together • http://learn.genetics.utah.edu/content/begin/traits/tour_chromosome.html

  3. Gene • A gene is thought to be a interrupted segment of DNA that contains coded instructions for specific traits. • Genes come in pairs and each possible version of a gene is called a allele

  4. Videos Heredity • http://learn.genetics.utah.edu/content/begin/traits/tour_heredity.html Traits • http://learn.genetics.utah.edu/content/begin/traits/tour_trait.html

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