Patterns of Heredity

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Patterns of Heredity

  1. 1. Complex Patterns of Heredity: Mrs. Neistadt Biology
  2. 2. Review: History of Genetics• *1866- Gregor Mendel began the study of genetics testing the inheritance of traits in the pea plant.• * He tested seven different traits: 1. Pea seed color 2. Flower color 3. Seed pod color 4. Seed shape or texture (wrinkled or smooth) 5. Seed pod shape 6. Stem length 7. Flower position
  3. 3. Vocabulary Review:1. A gene or trait that always shows itself is called _________________. Dominant Trait2. A gene or trait that will be hidden when adominant trait is present is called ___________. Recessive Trait3. A chart that shows possible gene combinationsof offspring is called Punnett Square_________________________.4. Organisms that have two like genes for a Homozygousgiven trait are called _____________.
  4. 4. Vocabulary Review:5. Organisms that have two unlike genes for agiven trait are called ___________. Heterozygous6. Another term for an organism that hastwo like genes for a certain trait is_________. Purebred7. Another term for an organism that hastwo unlike genes for a certain trait is Hybrid_______.
  5. 5. Complex Patterns of Heredity:• Some genes to not follow Mendel’s patterns, some are more complex.• *Incomplete Dominance- When one gene for a certain trait is not completely dominant over another a blending occurs. This is called incomplete dominance.
  6. 6. Incomplete Dominance:Traits blend together:
  7. 7. Complex Patterns of Heredity:• Sometimes two dominant genes are present for one trait.• *Co-dominance: A pattern of heredity that occurs when two genes are present for one trait. Neither gene is dominant or recessive over the other. They do not blend; they both show up in the organism.
  8. 8. Co-dominance:• Co-dominance: when two dominant genes are present for a single trait
  9. 9. Complex Patterns of Heredity:• * Multiple Alleles: Many traits are controlled by more than two possible variations. These traits are controlled by multiple alleles. – Example: Human blood groups
  10. 10. Complex Patterns of Heredity:• *Polygenic Trait: Some traits are controlled by many genes interacting with one another. These traits are called Polygenic Traits. – Examples: height, skin color, eye color
  11. 11. Polygenic Trait• Many traits working together:

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