No Bell Work today!Set up the next page in your journal…

• Page: 45• Date: 12-9-15• Title: Genetics – Codominance• Essential Question: How can I predict

genetic outcomes of non-Mendelian traits?

Codominance: when the genotype is heterozygous, both phenotypes appear equally

• Codominance produces spots, stripes, etc.• Note: when writing we show this with two different capital letters

1. A certain type of flower can be purple, white, or spotted. What would be the phenotypic outcome for two spotted flowers that were bred together?

P W

P

W

PP PW

PW WW

PP = PurplePW = SpottedWW = White

DAD = PWMOM = PW

25% purple, 50% spotted, 25% white

Blood Type is trait that is both codominant and has multiple alleles (meaning more than two).

* A and B are codominant, O is recessive. * Can also be written as IAIB for Type AB blood, ii for Type O, etc.

Blood Type

You can GIVE blood to…

You can RECEIVE

blood from…

A A or AB A or O

B B or AB B or O

AB AB only! Anyone

O All types O only!

3. What would be the expected phenotypes if a woman heterozygous for type A blood and a type AB man had children?

A B

A

O

AA AB

AO BO

AA, AO = Type AAB = Type AB

BB, BO = Type BOO = Type O

DAD = ABMOM = AO

50% Type A, 25% Type AB, 25% Type B

For the rest of today…

•Complete your Blood Typing worksheet.•Anything you don’t finish in class today is HOMEWORK!