Okay – Not really

Okay – Not really

Other Patterns of Heredity

Polygenic traits = several genes influence the trait. Examples: Eye color, weight, height, hair color,

& skin color.

Incomplete dominance = a trait that is in

between the two parent traits. Ex: Red snapdragon flower crossed with white

snapdragon flower results in

PINK snapdragon flowers.

Incomplete dominance

Co-dominance = Two dominant alleles are

expressed at the same time.

EX: Homozygous red horse crossed with a homozygous white horse results in

Red AND white horse

Co-dominance

Genes with 3 or more alleles are said to have

multiple alleles.

EX: Blood type in humans (ABO)

Multiple Alleles

Blood types

Sickle cell anemia

Recessive genetic disorder. Red blood cells are sickle shaped. Don’t move well through vessels.

Some traits are caused by mutations

Possible GenotypesRR = normal red blood cellRr = slightly curved red blood cellrr = sickle-shaped red blood cell

In tropical areas of the world, being heterozygous for sickle cell anemia is not so bad.It provides some immunity to the organism Responsible for malaria.

Recessive genetic disorder. Blood cannot clot well. Sex-linked trait. Mostly affects males.

Hemophilia

What gender has a greater chance of getting hemophilia?

What are the 4 main blood types?

Warm Up

Day 4 NotesDay 4 Notes

Blood Type = Multiple Alleles & Codominance

Blood type in humans is controlled by 3 alleles A, B, and O A & B are

codominant O is recessive

Phenotype Genotype

A AA or AO

B BB or BO

AB AB only

O OO only

A-type can only receive A or O blood

B-type can only receive B or O blood

AB-type can receive A, B, O, AB blood Universal Receiver

O-type can only receive O blood Universal Donor

Blood type continued…

Could you please help me? I have a question

that is NOT a homework question. I am a Junior in High School. "Could a man with type B blood and a woman with type AB produce a child with type O blood?" I think not, because type O is recessive, and the B's seem to be dominant. My cousin thinks yes. Thank you for your help.

Problem 1: Is a type O possible in this situation?

IMPOSSIBLE

I have been reading your info about

inheritance of blood types and I am getting very confused! I am trying to figure out what blood type the father of my son could have since my son and I are both type A. Could you please help?

Problem 2: What are the potential blood types of the father of my son?

The father could be: A. A, AB, B, or O B. Either A or B C. Either A or O

http://nobelprize.org/educational_games/

medicine/landsteiner/