Human blood type is determined by two versions of a gene drawn from how many possible sequences?
ATwo sequences
BThree sequences
CFour sequences
DSix sequences
Answer & Solution
Correct answer: B. Three sequences
1. A gene can exist in several alternative versions in a population.
2. There are three possible gene sequences on the human chromosome that code for blood type: sequence A, sequence B and sequence O.
3. All diploid human cells have two copies of the chromosome that determines blood type.
4. So the trait is set by which two of those three versions a person carries.
5. Two is the count of copies, not the count of sequences, which makes it the trap.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 10 'Cell Reproduction', sections 10.1-10.5_
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