Multople Alleles Flashcards
Multiple alleles
more than 2 alleles for the same gene
When multiple alleles exist there will be a hierarchy of dominance
Ex: fruit flies have different eye colours:
Red, apricot, honey, white
Dominant or codominant alleles are identified with a capital letter and or superscripts of letters
Recessive alleles are identified a lower case letter
- Human blood is a multiple allele system
- There are 3 different alleles that make 6 genotypes and 4 phenotypes
- the alleles control the production of antigens on red blood cells
Antigen
substance that causes your body to produce antibodies against it
- Allele IA produces antigen A on the red blood cells
- Antigen IB produces antigen B on the red blood cells
- Antigen i produces no antigen
Type A blood can receive from A and O blood
Type B blood can recieve from type B and O blood
Tyoe AB blood is a universal acceptor (A, B, AB, O)
Type ii blood can only recieve from O blood(universal donor)
Type A blood produces immune response to type B and type AB blood
Type B blood produces immune response to type A and AB blood
Type AB blood doesn’t form any antibodies since it’s a universal acceptor
Type O blood forms antibodies against A and B blood
Since type O blood doesn’t produce antigens they can donate to everyone else
Type AB blood is an example of codominence as both antigens are present on the cell
IAi blood and IBi blood are examples of dominant inheritance because A and B type blood are dominant to O type blood
