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 heredity YOUR 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,XC Xc,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