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DNA profiling, using short tandem repeats (STR) within a person’s DNA, helps to determine the genetic relationship between individuals - VCE - SSCE Biology - Question 39 - 2017 - Paper 1
Question 39
DNA profiling, using short tandem repeats (STR) within a person’s DNA, helps to determine the genetic relationship between individuals. DNA profiles based on four S... show full transcript
Worked Solution & Example Answer:DNA profiling, using short tandem repeats (STR) within a person’s DNA, helps to determine the genetic relationship between individuals - VCE - SSCE Biology - Question 39 - 2017 - Paper 1
Step 1
Which one of the following conclusions can be made using the information given?
Answer
To determine the relationships based on the DNA profiles provided:
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A. Individual 4 is the father of Individual 1: This is not possible as Individual 1 and Individual 4 share different alleles for several STRs.
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B. Individual 3 is the mother of Individual 4: Again, this is not true as the DNA profiles do not match in a parental way.
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C. Individual 5 could be the child of Individual 1 and 3: This cannot be confirmed without matching STRs that are common between any parents and this child.
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D. The parents of Individual 4 could be Individual 1 and 2: This statement is correct because for Individual 4’s STRs, we can see that the combinations of STRs resemble the STRs present in Individual 1 and Individual 2.
Hence, the correct conclusion that can be drawn is option D.