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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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Twilly143 Twilly143
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7 years ago
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
Secretion of blood type antigens is a simple Mendelian inheritance pattern due to a Dominant Se and a recessive se allele.

Most of the information in the two genotypes you stated do not matter. What is important is the Se/se alleles.
Both parents appear to be heterozygotes (Se se) so the possible genotypes of their offspring are SeSe: Sese:sese in the ratios 1:2:1.

Since Secretor status is dominant SeSe and Sese both show the dominant phenotype. Therefore the ratio of secretors to non-secretors from this mating should be 3:1
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