No Bell Work today!
Set up the next page in your journal…
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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?
25% purple,
50% spotted,
25% white
P
W
P
W
PP
PW
PW
WW
PP = Purple
PW = Spotted
WW = White
DAD = PW
MOM = PW
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?
50% Type A,
25% Type AB,
25% Type B
A
O
A
B
AA
AB
AO
BO
AA, AO = Type A
AB = Type AB
BB, BO = Type B
OO = Type O
DAD = AB
MOM = AO
For the rest of today…
•Complete your Blood Typing
worksheet.
•Anything you don’t finish in
class today is HOMEWORK!