Booklet project genetics review
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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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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


Genetics: The scientific study of heredityYOUR NAME


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)


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


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.


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


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


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


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


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


Pedigree

  • Pedigree: A chart that show how a trait is inherited in a family.

  • Example: Simple Inheritance


Pedigree

  • Sex Linked Chart

  • Males more often affected


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


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


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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