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Booklet Project – Genetics Review

Booklet Project – Genetics Review. Fold Four blank pages together The cover should say Genetics and include a definition and YOUR NAME 1. Mendelian or Simple Dominance 2. Incomplete Dominance 3. Codominance 4. Sex Linked 5. Pedigree 6. Mendel’s Laws 7. Multiple Alleles and Polygenic.

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Booklet Project – Genetics Review

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  1. Booklet Project – Genetics Review • Fold Four blank pages together • The cover should say Genetics and include a definition and YOUR NAME • 1. Mendelian or Simple Dominance • 2. Incomplete Dominance • 3. Codominance • 4. Sex Linked • 5. Pedigree • 6. Mendel’s Laws • 7. Multiple Alleles and Polygenic

  2. Genetics: The scientific study of heredityYOUR NAME

  3. Mendelian or Simple Dominance • Dominant: The gene whose trait shows when it is present • Recessive: The trait you do not see unless there are two • Homozygous: Two identical alleles • Heterozygous: Two different alleles • Allele: Different form of a gene • True-Breeding: If they self pollinate, they will have offspring identical to themselves (AA or aa) • Hybrid: A cross between parents with different traits (Aa)

  4. Mendelian or Simple Dominance • Example: Tall (TT) X Short (Tt) • Make a punnet square and tell the genotypes and phenotypes • 2 Alleles (T and t) • 3 Genotypes: TT, Tt and tt • 2 Phenotypes (Tall / Short) • Draw a picture

  5. Incomplete Dominance • Genotype: The genes in an individual (TT Tt tt) • Phenotype: How a trait looks • Incomplete Dominance: The heterozygous phenotype is somewhere in between the two homozygous phenotypes (Blended or mixture) Neither allele is completely dominant.

  6. Incomplete Dominance • Example: Red parent and White parent: offspring of red, white and pink • RR and WW • Make a punnet square and tell the genotypes and phenotypes • 2 Alleles (R and W) • 3 Genotypes: RR, WW, RW • 3 Phenotypes Red, White, Pink • Draw a picture

  7. Codominance • Codominance: Both alleles contribute to the phenotype (both are seen - not blended) • This is usually described as solid color parents with offspring that are striped or spotted

  8. Co Dominance • Example: Blood Type • IA, IB, and i • Make a punnet square and tell the genotypes and phenotypes • 3 Alleles (IA, IB, and i) • 6 Genotypes: (IAIA, IAi, IBIB, IBi, IAIB, ii) • 4 Phenotypes (types: A, B, AB and O) • Draw a picture

  9. Sex Linked Genes • Sex Linked Genes: Traits that are inherited through either the X or Y chromosome • Affect males more often because they cannot mask an X linked trait with a dominant allele

  10. Sex Linked Genes • Example: Color Blindness • Make a punnet square and tell the genotypes and phenotypes • 2 Alleles (XC, Xc ) • 4 Genotypes: XCXC,XCXc,XCY and XcY • 5 Phenotypes (F No Trait, F Carrier, Female with Trait, Male No Trait, and Male with Trait) • Draw a picture

  11. Pedigree • Pedigree: A chart that show how a trait is inherited in a family. • Example: Simple Inheritance

  12. Pedigree • Sex Linked Chart • Males more often affected

  13. Mendel’s Laws • 1. The Law of Segregation: Each gamete gets only one copy of a gene • 2. Independent Assortment: Different traits are inherited separately

  14. Multiple Alleles • Multiple alleles means that more than two alleles can exist in a population, however each individual still only has two alleles for that trait

  15. Polygenic Trait • Some traits are controlled by more than one gene • Examples: Eye color and skin color • This explains the wide variation in eye and skin color

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