Day 30 Co-Dominance and Blood Typing
Student Assessment:
Lecture:
Recap!
-We have learned about Mendelian traits which are either dominant or recessive
-We learned about sex-linked genes
-We learned about incomplete dominant traits
Now for Co-dominant traits
-A Co-dominant trait is the opposite of an incomplete dominant trait
-With an incomplete dominant trait the two alleles blend together
-With a co-dominant trait both alleles are expressed without any blending
Here is an example of a co-dominant trait that is also sex-linked
All Calico cats are females (Well, there is a chance of having a boy calico cat. Can you guess how?)
Now lets talk about human blood type another good example of a co-dominant trait
For human blood type there are three different alleles
A
B
O
Both A and B alleles are co-dominant and O is recessive
-What does this mean?
If you get...
Genotype
AA= Type A blood
AO= Type A blood
AB= Type AB blood
BB= Type B blood
BO= Type B blood
OO= Type O blood
Blood type means what type of recognition protein is made by your blood cells
-A blood makes A proteins
-B blood makes B protein
-AB blood makes both A and B proteins
-O does not make any proteins
Watch this video and take detailed notes
Student Practice:
Lets practice!