Biology School Worksheet (Page 4 of 6) in pdf

Biology School Worksheet Page 4

When doing blood type crosses, you will need to know whether at type A or B person is heterozygous or

•

homozygous. Type O's are automatically OO and type AB is automatically AB. Crosses are performed the same as

any other.

The blood type determines what antibodies are located within the blood. Type A blood has type B antibodies. If type

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B blood is put into their bodies, their immune system reacts as if it were a foreign invader, the antibodies clump the

blood - can cause death.

Type AB blood has no antibodies, any blood can be donated to them - they are called the "universal acceptors"

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Type O blood has no surface markers on it, antibodies in the blood do not react to type O blood, they are called

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the "universal donors"

Activity:

Human b lood t ypes a re d etermined b y g enes t hat f ollow t he C ODOMINANCE p attern o f i nheritance. T here a re t wo d ominant

alleles ( I

a nd I

) a nd o ne r ecessive a llele ( i).

Write t he g enotype f or e ach p erson b ased o n t he d escription:

Homozygous f or t he “ B” a llele

______

Heterozygous f or t he “ A” a llele

______

Type O

______

Type “ A” a nd h ad a t ype “ O” p arent

______

Type “ AB”

______

Blood c an b e d onated t o a nybody

______

Can o nly g et b lood f rom a t ype “ O” d onor

______

Pretend t hat J oe i s h omozygous f or t he t ype B a llele, a nd A my i s t ype “ O.” W hat a re a ll t he p ossible b lood t ypes o f

their b aby?

Biology School Worksheet Page 4