Notes for D3.2.9 ABO blood groups as an example of multiple alleles - IB | RevisionDojo
D3.2.9 ABO blood groups as an example of multiple alleles Notes
ABO Blood Groups Arise From Multiple Alleles
The ABO blood group system is an example of a gene with multiple alleles (more than two alleles for a single gene).
Unlike simple traits with only two alleles (e.g., dominant and recessive), the ABO system has three alleles: $A$, $B$, and $i$.
This system produces four possible blood types (A, B, AB, O) from the combination of three alleles.
Multiple Alleles Allow for Greater Genetic Diversity
Unlike simple traits with only two alleles (e.g., dominant and recessive), some genes have multiple alleles.
In the ABO system:
IAI^AIA: Produces an antigen with acetylgalactosamine on red blood cells.
IBI^BIB: Produces an antigen with galactose on red blood cells.
iii: Produces no antigen, making this allele recessive.
Punnett Grids Help Predict Blood Type Inheritance
Punnett grids are useful tools for predicting offspring blood types.
$I^A$
$i$
$I^B$
$I^A I^B$ (Type AB)
$I^B i$ (Type B)
$i$
$I^A i$ (Type A)
$ii$ (Type O)
Self review
What are the three alleles in the ABO blood group system?
Draw a punnet grid to determine what blood types could result from a cross between a Type AB parent and a Type O parent.
Unlock the rest of this chapter with aFreeaccount
Nice try, unfortunately this paywall isn't as easy to bypass as you think. Want to help devleop the site? Join the team at https://revisiondojo.com/join-us. exercitation voluptate cillum ullamco excepteur sint officia do tempor Lorem irure minim Lorem elit id voluptate reprehenderit voluptate laboris in nostrud qui non Lorem nostrud laborum culpa sit occaecat reprehenderit
Definition
Paywall
(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.
anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
Duis aute irure dolor in reprehenderit
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Note
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.
Excepteur sint occaecat cupidatat non proident
Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.
Tip
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.
End of article
Want a cheatsheet?
View a summary cheatsheet for D3.2 Inheritance
Flashcards
Remember key concepts with flashcards
21 flashcards
How are certain blood types linked to disease susceptibility?
Lesson
Recap your knowledge with an interactive lesson
14 minute activity
Note
Introduction to the ABO Blood Group System
The ABO blood group system is a fundamental genetic trait in humans, discovered by Karl Landsteiner in 1901.
It consists of four main blood types: A, B, AB, and O.
These blood types are determined by specific antigens on the surface of red blood cells.
DefinitionAntigenA molecule or substance that triggers an immune response, often found on the surface of cells.
AnalogyThink of antigens like name tags on red blood cells, identifying them as belonging to a specific blood type.
