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With respect to the ABO blood group locus it is possible to produce children of four different phenotypes if the parents are A - VCE - SSCE Biology - Question 4 - 2003 - Paper 1
Question 4
With respect to the ABO blood group locus it is possible to produce children of four different phenotypes if the parents are A. type B x type B. B. type A x type B.... show full transcript
Worked Solution & Example Answer:With respect to the ABO blood group locus it is possible to produce children of four different phenotypes if the parents are A - VCE - SSCE Biology - Question 4 - 2003 - Paper 1
Step 1
C. type O x type AB.
Answer
To determine if type O x type AB parents can produce children of four different blood phenotypes, we need to analyze the possible genotypes and resulting phenotypes.
Blood Types Overview:
- Blood type A can have genotype AA or AO.
- Blood type B can have genotype BB or BO.
- Blood type AB has genotype AB.
- Blood type O has genotype OO.
Parents' Genotypes:
- Type O (OO) can only contribute alleles 'O'.
- Type AB (AB) can contribute either 'A' or 'B'.
Possible Offspring Genotypes:
- If the type O parent contributes 'O' and the type AB parent contributes 'A', the child will have genotype AO, resulting in blood type A.
- If the type O parent contributes 'O' and the type AB parent contributes 'B', the child will have genotype BO, resulting in blood type B.
This means that the possible offspring from type O and type AB parents could have either type A or type B, resulting in two phenotypes.
Conclusion: Since only two phenotypes are produced (type A and type B), the parents cannot produce children of four different phenotypes. Therefore, option C is incorrect.