Which pedigree represents an X-linked dominant trait?
A - VCE - SSCE Biology - Question 24 - 2013 - Paper 1
Question 24
Which pedigree represents an X-linked dominant trait?
A.
B.
C.
D.
Worked Solution & Example Answer:Which pedigree represents an X-linked dominant trait?
A - VCE - SSCE Biology - Question 24 - 2013 - Paper 1
Step 1
Identify the characteristics of X-linked dominant traits
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Answer
X-linked dominant traits typically manifest in both males and females, but males exhibit the trait if they inherit just one affected X chromosome. Additionally, male offspring cannot inherit the trait from their fathers, only from their mothers.
Step 2
Analyze the pedigrees provided
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Answer
Examine each pedigree option (A, B, C, D) to determine which best illustrates the inheritance pattern of an X-linked dominant trait. Focus on patterns of affected individuals in relationship to their parents.
Step 3
Select the correct pedigree
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Answer
Based on the analysis, pedigree D represents an X-linked dominant trait. It shows that the trait is passed from an affected mother (who has one affected X chromosome) to both sons and daughters, indicating the inheritance pattern of X-linked dominance.
