Multiple Allele Traits

1
Multiple Allele Traits

• Traits that are coded for by more than two alleles

2
Blood Types in Humans

• Typed by proteins it contains
• Antigens (on cell surface)
• Antibodies (in blood plasma)
• Blood typing involves identifying the antigens on
  the red blood cell membrane

3
ABO Blood Groups

• 4 Different blood types
• Grouped according to the presence or absence of A
  and B antigens
• If you mix these blood types incorrectly the
  blood will clump and patient can die.

4
Blood Group A

• A antigens on cell surface
• B antibodies in plasma

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Blood Group B

• B antigens on cell surface
• A antibodies in plasma

6
Blood Group AB

• Both A and B antigens on cell surface
• No antibodies in plasma
• Universal acceptor
• Can accept A, B, and O blood

7
O Blood Type

• No antigens
• Antibodies for both A and B
• Universal donor

8
Blood Transfusions

• Who can receive blood from whom?

9
Gene Control of Blood Type

• Controlled by three alleles A, B, and O

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Blood Type Cross Examples
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Blood Type Cross Examples
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Labrador Coat Color

• BBEE
• BbEE
• BBEe
• BbEe
• bbEE
• bbEe
• BBee
• Bbee
• bbee