starter

STARTER

• Each pair will be given a card with a key term on it

• As a pair you have to come up with a definition AND an illustration and write it onto the card

• Have the card checked

• Staple it to the Genetics Word Wall

Blood Type Genetics

In traits with multiple alleles, each individual can carry any two of the several possible

alleles. 

Ex. BLOOD TYPE 

The gene for blood type has 3 possible alleles.

Blood Group Genes

• There is 1 gene for blood type

• There are 3 alleles for blood type:

A, B, & i (O).

• A&B are codominant and both dominant to i (O).

The ABO blood systemGenotypes Phenotypes (Blood

types)IA IA AIA IB ABIAi A

IB IB BIBi Bii O

Note: • Blood types A and B have two possible genotypes –

homozygous and heterozygous.• Blood types AB and O only have one genotype each.

How blood types work….

http://learn.genetics.utah.edu/units/basics/blood/types.cfm

http://www.lanecountyblood.org/images/other/bloodfacts.jpg

45%

40%

11%

4%

How common are the 4 blood types?

Group Practice Problem:1. A mother is IA IB and a father is ii. Draw the

punnett square. IA IB

ii

 What is the probability their offspring will have A

type blood? Can they have an offspring with O blood?

Practice Problems:1. A mother is IA IB and a father is ii. Draw the

punnett square. IA IB

i IA i IB ii IA i IB i

 What is the probability their offspring will have A type blood?

50% Can they have an offspring with O blood? No

STARTER

• A woman has a heterozygous genotype for blood group B. She is expecting a baby with a man who is homozygous Group A. What are the possible blood groups for their baby?

I. Group OII. Group AIII.Group AB

A. II and III onlyB. I and II onlyC. I and III onlyD. I, II and III

Rh Factors• Scientists sometimes study Rhesus monkeys to learn

more about the human anatomy.

• While studying Rhesus monkeys, a certain blood protein was discovered.

• This protein is also present in the blood of some people. Other people, however, do not have the protein.

• The presence of the protein, or lack of it, is referred to as the Rh (for Rhesus) factor.

• If your blood does contain the protein, your blood is said to be Rh positive (Rh+).

• If your blood does not contain the protein, your blood is said to be Rh negative (Rh-).

A+ A-B+ B-

AB+ AB-O+ O-

http://www.fi.edu/biosci/blood/rh.html

ARGHGH – can you save a life today!

Now have a go at the blood typing problems!