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A woman of blood group A, whose genotype is unknown, and a man of blood group O have a child - VCE - SSCE Biology - Question 10 - 2012 - Paper 1
Question 10
A woman of blood group A, whose genotype is unknown, and a man of blood group O have a child. Genetically, this is an example of a A. self cross. B. test cross. C. d... show full transcript
Worked Solution & Example Answer:A woman of blood group A, whose genotype is unknown, and a man of blood group O have a child - VCE - SSCE Biology - Question 10 - 2012 - Paper 1
Step 1
Identify the type of genetic cross involved
Answer
In this scenario, the woman has blood group A and her genotype is unknown. The man has blood group O. A test cross is used to determine the genotype of an individual with a dominant phenotype by crossing it with a homozygous recessive individual. Since the woman’s genotype is unknown, crossing her with the known genotype of blood group O (genotype ii) will help determine if she is homozygous (genotype AA) or heterozygous (genotype AO).
Thus, this genetic situation exemplifies a test cross.