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Achondroplasia is an autosomal dominant trait in humans that results in a form of dwarfism - VCE - SSCE Biology - Question 13 - 2006 - Paper 1
Question 13
Achondroplasia is an autosomal dominant trait in humans that results in a form of dwarfism. In some cases a child with achondroplasia is born to parents who have nor... show full transcript
Worked Solution & Example Answer:Achondroplasia is an autosomal dominant trait in humans that results in a form of dwarfism - VCE - SSCE Biology - Question 13 - 2006 - Paper 1
Step 1
B. a mutation has occurred in a gamete of either the mother or the father.
Answer
In the context of autosomal dominant traits such as achondroplasia, a child can inherit the trait even if both parents are of normal height. The most plausible explanation here is that a mutation occurred in a gamete (sperm or egg) of one of the parents. Since the mutation is dominant, it can manifest in the child regardless of the parents' phenotypic presentation. This makes option B the correct answer.