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From an analysis of this pedigree, individuals with the same mitochondrial DNA (mtDNA) include: A - VCE - SSCE Biology - Question 1 - 2009 - Paper 1
Question 1
From an analysis of this pedigree, individuals with the same mitochondrial DNA (mtDNA) include: A. Kathy and Peter. B. Peter and Jethro. C. Jay, Rob and Jethro. D. J... show full transcript
Worked Solution & Example Answer:From an analysis of this pedigree, individuals with the same mitochondrial DNA (mtDNA) include: A - VCE - SSCE Biology - Question 1 - 2009 - Paper 1
Step 1
A. Kathy and Peter.
Answer
Inspect the pedigree carefully to identify any lineages or maternal relationships. Kathy and Peter must share a common maternal ancestor for them to have the same mtDNA. If the pedigree indicates they are not directly related through maternal lines, this option can be ruled out.
Step 2
Step 3
C. Jay, Rob and Jethro.
Answer
Examine the connections among Jay, Rob, and Jethro. If all three individuals are shown to ascend from the same female ancestor, they would share the same mtDNA. However, if there are differing maternal sources in the pedigree, this option should not be selected.
Step 4
D. Jackson, Elliot and Dashiell.
Answer
Upon reviewing the connections in the pedigree, if Jackson, Elliot, and Dashiell can be traced back to the same maternal ancestor, they would share the same mtDNA. This option has the strongest evidence according to typical inheritance patterns of mtDNA.