In humans the ABO blood group is controlled by a single gene with three alleles - VCE - SSCE Biology - Question 11 - 2005 - Paper 1
Question 11
In humans the ABO blood group is controlled by a single gene with three alleles. In the ABO blood group six different genotypes and four different phenotypes are pos... show full transcript
Worked Solution & Example Answer:In humans the ABO blood group is controlled by a single gene with three alleles - VCE - SSCE Biology - Question 11 - 2005 - Paper 1
Step 1
A. the environment influencing the phenotype.
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Answer
This option refers to factors in the environment that can affect phenotypes, which is not the primary concept for ABO blood groups.
Step 2
B. discontinuous variation.
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Discontinuous variation refers to distinct categories of phenotypes without intermediate forms. The ABO blood group fits this definition, as it has distinct blood types: A, B, AB, and O.
Step 3
C. polygenic inheritance.
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Polygenic inheritance involves multiple genes influencing a trait, which is not the case for the ABO blood group as it is controlled by a single gene.
Step 4
D. linked alleles.
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Linked alleles are genes that are located close to each other on the same chromosome and tend to be inherited together. This concept does not apply directly to the ABO blood group system.
