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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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meenal94 meenal94
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7 years ago
People of the genotype SeSe or Sese secrete the A and B antigens.
Those of genotype sese DO NOT.

Note: There is epistasis between the genetic systems, because people with blood group O are NON-SECRETORS regardless of their secretor genotype.

In the following type, what is the expected ratio of secretors to non-secretors?
IA IO Se se X IB IO Se se
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#1
7 years ago
Blood group O doesn't mean that your blood cells are blank. They still have the H-antigen which people with blood group O can secrete. See an explanation of  the ABO blood group system here:
https://en.wikipedia.org/wiki/ABO_blood_group_system#Antigens

But we can still answer the question with the limitations given. Here is a Punnett square showing all the genotypes possible in the progeny:

http://tinypic.com/r/iokwgl/9

In red are those that only have O alleles or lack the Se allele. Secretors : Non-secretors = 9:7
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