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The f antigen occurs under what conditions?

1) When C and e are cis
2) When VS is present
3) When c and e are cis
4) When C and c are both present

User Rodolph
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1 Answer

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Final answer:

The f antigen occurs when the c and e alleles of the RhCE gene are in the cis position on the same chromosome.

Step-by-step explanation:

The "f antigen" of the Rh blood group system is a complex antigenic site on the red blood cell surface which arises when the RhCE gene's c and e alleles are in cis position to each other, meaning they are on the same chromosome.

Therefore, the f antigen occurs under the condition when c and e are cis (option 3). This is different from other antigen patterns in the Rh system or other blood group systems like the ABO system.

User Sharethefun
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