Business communication Chapter 10 Review questions
Were the babies switched? – The Genetics of Blood Typesi
Two couples had babies on the same day in the l
same hospital. Denise and Earnest had a girl, ‘ 1
Tonja. Danielle and Michael had twins, a boy,
Michael, Jr., and a girl, Michelle.
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Danielle was convinced that there had been a lonm Michael 1: Michelle
mix-up and she had the wrong baby girl. Tonja and Michael Jr. looked more like twins since they
both had darker skin, while Michelle had lighter skin. Danielle insisted on blood type tests for both
families to check whether there had been a mix-up.
Blood Types and Genetics
Each person has one of the blood types shown in this chart. Your blood type is determined by
whether your red blood cells have type A and/or type B carbohydrate molecules on the surface.
A Person With:
Type A carbohydrate molecules
Type A bIOOd on their red blood cells
Type B carbohydrate molecules
Type B bIOOd on their red blood cells
Both type A and type B carbohydrate
Type AB bIOOd molecules on their red blood cells
Neither type A nor type B carbohydrate
Type O bIOOd molecules on their red blood cells
These four different blood types result from different alleles of a single gene in the DNA.
These alleles give the directions for making different versions of a protein enzyme that puts
different types of carbohydrate molecules on the surface of red blood cells.
m Gives the directions for making a version of the enzyme that:
puts type A carbohydrate molecules on the surface of red blood cells
puts type B carbohydrate molecules on the surface of red blood cells
is inactive; doesn’t put either type of carbohydrate molecule
on the surface of red blood cells
1. Each person has two copies of this gene, one inherited from his/her mother and the other
inherited from his/her father. Complete the following table to relate genotypes to blood types.
This person’s cells make: Blood Type
the version of the enzyme that puts type A carbohydrate molecules on the
surface of red blood cells.
the inactive protein that doesn’t put either type A or type B carbohydrate
molecules on the surface of red blood cells.
both the version of the enzyme that puts type A carbohydrate molecules
on the surface of red blood cells and the inactive protein
2. In a person with the IAigenotype, which allele is dominant, IA or i? Explain your reasoning.
