1. GENETICS….. FINALLY!

2.  We all have different traits/characteristics  Traits – eye color, hair color and texture, height, etc.

3.  Our genes that we inherit from our parents determine our traits.

4.  Sections of DNA that determine a particular trait.  Example:  Hair color or eye color

5.  We inherit 2 genes for any particular trait – one from dad and one from mom.

6. Have the same ‘trait’ in the same place on a chromosome pair. This is universal among a species. If the gene for hair color is on chromosome 5 in one person, it will be on chromosome 5, in the same place for EVERY person.

7.  Different forms of a gene for a particular trait.  Example:  Hair texture – curly or straight  What are the alleles for hair color?

8.  Both alleles for a particular trait are the same.  Example:  B = brown eye gene and b = blue eye gene  BB = homozygous for brown eyes  bb = homozygous for blue eyes

9.  The alleles for a particular trait are different.  Example –  Bb – heterozygous (hybrid) brown eyes

10.  An allele that is fully expressed in a heterozygous pair

11.  Traits that will ONLY be expressed if both alleles are present.

12. Phenotype vs Genotype  A PHENOTYPE is how the traits appear. Remember: Ph-Physical appearance  A GENOTYPE refers to your genes  For example, someone with the phenotype brown eyes can have the genotype Bb. They are known as a ‘carrier’ because they carry the gene for blue eyes.

13. 1822-1884

15.  Predicts the results of genetic crosses

16.  What is the result of a mate between a hybrid tongue roller and a non-tongue roller?  R=tongue roller  r = non-tongue roller

17.  Traits that are neither dominant or recessive. Offspring receives a blend of each parents traits.  Example:  Red snap dragons are crossed with white snap dragons to make pink snap dragons.