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Understanding Co-Dominance and Incomplete Dominance in Genetics

Explore the similarities and differences between co-dominance and incomplete dominance, crucial concepts in genetics. Co-dominance occurs when both alleles in a genotype contribute equally and visibly to the phenotype, exemplified by AB blood type. Incomplete dominance, on the other hand, results in a blended phenotype, as seen in snapdragon flower colors. This overview will clarify these mechanisms, supported by genetics practice problems and vocabulary related to polygenic and sex-linked traits. Gain insight into inheritance patterns and their implications in genetic studies.

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Understanding Co-Dominance and Incomplete Dominance in Genetics

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  1. Question of the Day Question: How are co-dominance and incomplete dominance similar? Different? Answer: … … … • 3’s Turn In: • Genetics Practice Problems #1-24 • p. 320 Analyzing Data 1, 2, 4 • Who Gets the Money, opened to p. 2

  2. Unit 6 Vocab Sheet

  3. Unit 6 Vocabulary • polygenic trait- controlled by two or more genes; Ex: skin & eye color Additive effects of 2+ genes on a trait Seen when the trait varies along a continuum

  4. Polygenic: In Labradors, the “B” gene for black/brown coat color is turned off by the “E” gene!

  5. Unit 6 Vocabulary • 45. sex-linked trait- trait whose gene is located on a sex chromosome; Ex- colorblindness • Gene is usually recessive & on X chromosome • XN = normal, • Xn= colorblind • One gender will have the trait more often

  6. Colorblindness • Vision in Men:

  7. Unit 6 Vocabulary • 45. sex-linked trait- trait whose gene is located on a sex chromosome; Ex- colorblindness N n XNXN XNXn N • Gene is usually recessive & on X chromosome • XN = normal, • Xn= colorblind • One gender will have the trait more often Girl, carrier Girl, normal XNY XnY Boy, colorblind Boy, normal

  8. Unit 6 Vocabulary • 42. pedigree- a diagram showing the lineage of a family for a particular trait

  9. Pedigree Example: Polydactyly

  10. Pedigree Practice: Addams Family

  11. Start Homework:- Genetics Practice Problems #25- 45- Finish Who Gets the Money- Finish Vocab Sheet- Finish Addams Family Pedigree

  12. GATTACA

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