In humans, most genetic variation in this trait is found in the last exon on chromosome 9 at band 9q34.2.
The P234S mutation in an enzyme that regulates this phenotype completely reverses its specificity. In humans, most genetic variation in this trait is found in the last exon on chromosome 9 at band 9q34.2. The most common allele controlling this phenotype has a guanine-261 deletion to cause a frameshift. The gene controlling this trait encodes proteins that either have N-acetylgalactosamine or galactose sugar groups. After discovering polio, Karl Landsteiner figured out this phenotype's molecular basis. The gene controlling this trait determines how the von Willebrand factor is post-translationally glycosylated. This phenotype is a classic example of co-dominance, since heterozygotes of its dominant allele do not agglutinate when challenged by either of two antigens. For 10 points, name this trait that in humans is usually classified as A, B, AB, or O.
The P234S mutation in an enzyme that regulates this phenotype completely reverses its specificity.
blood type [or word forms; or any specific blood type like A, AB, B, or O until it is read] &lt;Biology&gt;