1. Dominant and Recessive Traits

2. What are traits? Physical Traits Acquired Traits Behavioral Traits
Can be seen by others
Eye color, hair color, height, left handed
Acquired Traits
Learned skills
Playing a sport, riding a bike, playing a musical instrument
Behavioral Traits
Instinctual actions
Nest building and migration

3. Review Terms Used in Modern Genetics
Genotype
The particular alleles (genes) an individual carries
They are inherited from your biological parents
Genes control your traits
Phenotype
An individual’s observable traits
What people can SEE when they look at you

4. Review Terms Used in Modern Genetics
An individual with non-identical alleles of a gene is heterozygous for that gene
Examples: Bb, Tt, Aa
An individual with identical alleles of a gene is homozygous for that gene
Examples: BB or bb, TT or tt

5. Terms Used in Modern Genetics
An allele is dominant if its effect masks the effect of a recessive allele paired with it
Capital letters (A) signify dominant alleles; lowercase letters (a) signify recessive alleles
Homozygous dominant (AA)
Homozygous recessive (aa)
Heterozygous (Aa)

6. What traits do you have?
We will go through the most common traits that people have
On your sheet, record if you have the mentioned trait or not
You may have to ask your neighbor for help 

7. Detached (EE, Ee) or attached (ee) Earlobes

8. Can Tongue Roll (TT, Tt) or Can’t (tt)

9. Dimples (DD, Dd) No Dimples (dd)

10. Right (RR, Rr) or Left (rr) handed?

11. Freckles (FF, Ff) No Freckles (ff)

12. Curly (HH, Hh) or Straight (hh)

13. Cleft Chin (CC, Cc) or No Cleft (cc)

14. Allergies (AA, Aa) or No Allergies (aa)

15. Hand Clasp Right over Left?

16. Normal (BB, Bb) Color Blindness (bb)
Can you see the number inside the circle?
If you cannot, you may be colorblind

17. Widow’s Peak (WW, Ww) or Straight (ww)

18. Data We will now record our class data and graph our results
Does our data support which genes are dominant and which genes are recessive?
What about the whole 7th grade?