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 is incorrect as the ABO blood group is primarily determined by genetic factors rather than environmental influences.
Step 2
B. discontinuous variation.
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Answer
The ABO blood group represents discrete categories (A, B, AB, O), making this option correct. Discontinuous variation refers to traits that have distinct and separate forms.
Step 3
C. polygenic inheritance.
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Answer
This option is incorrect because polygenic inheritance involves multiple genes influencing a trait, while the ABO blood group is controlled by a single gene.
Step 4
D. linked alleles.
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Answer
This option is also incorrect as linked alleles refer to genes that are located close together on the same chromosome, which is not applicable to the ABO blood group as it involves a single gene.
