Multiple Alleles

Multiple Alleles - MultipleAlleles

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Multiple Alleles Many genes exist in populations in more than two allelic forms. The ABO blood groups in humans are determined by three alleles:  I A I B , and  i . o Both the  I and  I alleles are dominant to the  allele. o The  I and  I alleles are codominant to each other. Because each individual carries two alleles, there are six possible genotypes and four possible blood types. o Individuals who are  I A I or  I A are type A and have type A carbohydrates on the surface of their red blood cells. o Individuals who are  I B I or  I B are type B and have type B carbohydrates on the surface of their red blood cells. o Individuals who are  I A I are type AB and have both type A and type B carbohydrates on the surface of their red  blood cells. o Individuals who are  ii  are type O and have neither carbohydrate on the surface of their red blood cells. Matching compatible blood groups is critical for blood transfusions because a person produces antibodies against  foreign blood factors. o
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

Page1 / 2

Multiple Alleles - MultipleAlleles

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online