1. Biology Warm-up ( ):
QUESTION: What the difference between dominant and recessive genes? ANSWER: Dominant is always expressed when present. Recessive is only expressed when no dominant genes are present.

2. Today’s Objectives: Students will be able to…
Set-up and use a Punnett Square to predict traits in offspring
Compare dominant and recessive genes and traits and observe them in humans.

3. Dominant and Recessive Traits
Investigating Allele
Frequencies in the Classroom

4. Tongue-Roller

5. Free earlobe

6. Widow’s Peak

7. Dimples on cheek

8. Long eyelashes

9. Natural dark hair

10. Curly hair

11. Brown, hazel / green eyes

12. Roman nose

13. Hair on mid digit

14. Right-Handedness

15. Right-Handedness

16. Bent little finger

17. Left thumb over right

18. Hitchhikers Thumb

19. Second Toe Longer

20. Cleft Chin

21. Freckles

22. Wet Earwax

23. Biology Cool-down (2-23-10):
QUESTION: Are dominant traits more common then recessive ones? ANSWER: Not always. A recessive trait can be more common in some populations.