1. Heredity

2. We know that traits are inherited, but how?
What characteristics do you have in common with your parents? Your grandparents?
If you have siblings, what characteristics do you have in common with them?

3. Take a look at yourself…
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4. Dominant or Recessive?

5. Cheek Dimples cheek dimples are dominant
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6. Brown/black eyes?
brown/black eyes are dominant over blue/green eyes

7. Attached Earlobes?
attached earlobes are recessive

8. Widow’s Peak? pointed hairline is dominant over straight hairline
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9. Hitchhiker’s thumb? a straight thumb is dominant over a bent thumb
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10. Tongue roller? the ability to roll your tongue is dominant
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11. Left thumb on top?
when you fold your hands, the left thumb on top is dominant over the right thumb on top
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12. 6 fingers? polydactyly is dominant
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13. How are these traits inherited?

14. Monks are known for many things…
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15. Gregor Mendel (1822-1884) Austrian monk
did experiments with garden peas that laid the foundation for modern genetics
“the father of modern genetics”
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16. Image from: http://www. tutorvista

17. Image from: http://www. biology. iupui

18. Image from: http://www. bioinformatics

19. Mendel’s conclusions
inherited characteristics are controlled by factors that occur in pairs
one factor masks the effect of another (the principle of dominance)
a pair of factors separate during the formation of sex cells
each sex cell contains only one factor for each characteristic

20. Punnett square
chart that organizes the possible combination of “factors” in offspring
See this website for a simple animation on creating a Punnett square:

21. Image from: http://childofthecornx.livejournal.com/18092.html

22. Image from: http://edu. glogster. com/glog. php

23. Questions
Read 4.2 (p ) and answer the following questions: #1,3 (p )