1. Homework #3 due now
Bonus #2 posted
Homework #4 is due 12/3/07 (only if needed)
No class W 11/21

2. Genotype
Phenotype
Dominant
Recessive

3. Human blood types
AA or AO
BB or BO AB OO

4. If Frank has B blood type,
his Dad has A blood type,
And his Mom has B blood type…
Should Frank be worried?

5. Mom=B blood
BB or BO
Dad=A blood
AA or AO
possible
genotypes

6. Mom=B blood BB or BO Dad=A blood AA or AO all B / 50% B and 50% O
possible
genotypes
all B / 50% B and
50% O
all A / 50% A and
50% O
Gametes

7. Mom=B blood BB or BO Dad=A blood AA or AO Gametes all B / 50% B and
possible
genotypes
Gametes
all B / 50% B and
50% O
all A / 50% A and
50% O
Frank can be BO
= B blood
…no worries

8. Mom=B blood BB or BO Dad=A blood AA Gametes all B / 50% B and 50% O
Grandparents
AB and AB
Mom=B blood
BB or BO
Dad=A blood AA
possible
genotypes
Gametes
all B / 50% B and
50% O
all A
Frank can be BO or BB
= B blood
…Uh-Oh

9. Pedigree, tracing the genetic past
Dom.
Rec.
Rec.
Dom.

10. We can also predict the future
Fig 2.12

11. Inheritance of blood types
Mom = AB
Dad = AB

12. Inheritance of blood types
Mom = AB
Dad = AB
Gametes:
A or B
A or B

13. Mom = AB Dad = AB A or B A or B Gametes: Dad A or B 25% AA 50% AB
Inheritance of blood types
Mom = AB
Dad = AB
A or B
A or B
Gametes:
Dad
A or B
Chance of each phenotype for
each offspring
25% AA
50% AB
25% BB AA
A or B AB
Mom AB BB

14. Single genes controlling a single trait are unusual
Single genes controlling a single trait are unusual. Inheritance of most genes/traits is much more complex…
Dom.
Rec.
Rec.
Dom.

15. Genotype
Phenotype
Genes code for proteins (or RNA). These gene products give rise to traits…

16. Human blood types
AA or AO
BB or BO AB OO

17. It is rarely this simple.
Genotype
Phenotype
Genes code for proteins (or RNA). These gene products give rise to traits…
It is rarely this simple.
Figs

18. Incomplete dominance givers rise to blending.

19. Human blood types
AA or AO
BB or BO AB
(Codominance) OO

20. Sex determination is normally inherited by whole chromosomes or by number of chromosomes.

21. X/Y chromosomes in humans

22. The X chromosome has many genes; the Y chromosome only has genes for maleness.

23. Human sex chromosomes
Fig 2.25

24. X/Y chromosomes in humans should give rise to equal numbers of males and females

25. 105 males : 100 females (live births)
Why?

26. 105 males : 100 females (live births)
Why?

28. Sex-linked traits are genes located on the X chromosome

29. Color Blind Test

30. No one affected, female carriers
Sex-linked traits: Genes on the X chromosome
A= normal;
a= colorblind
colorblind
normal
No one affected, female carriers
similar to Fig 2.27

31. 50% of males affected, 0 % females affected
Sex-linked traits: Genes on the X chromosome
A= normal;
a= colorblind
normal
normal
50% of males affected,
0 % females affected
similar to Fig 2.27

32. 50% males affected, 50% females affected
Sex-linked traits: Genes on the X chromosome
A= normal;
a= colorblind
colorblind
normal
50% males affected,
50% females affected
similar to Fig 2.27

33. Sex-linked traits: Genes on the X chromosome A= normal ; a= colorblind
No one affected, female carriers
50% of males affected, 0 % female affected
50% males affected, 50% females affected
similar to Fig 2.27

34. Homework #3 due now
Bonus #2 posted
Homework #4 is due 12/3/07 (only if needed)
No class W 11/21