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When a gene has multiple alleles, the alleles can be represented by a series of numbers instead of letters - VCE - SSCE Biology - Question 6 - 2010 - Paper 1
Question 6
When a gene has multiple alleles, the alleles can be represented by a series of numbers instead of letters. The following pedigree outlines the alleles for the same ... show full transcript
Worked Solution & Example Answer:When a gene has multiple alleles, the alleles can be represented by a series of numbers instead of letters - VCE - SSCE Biology - Question 6 - 2010 - Paper 1
Step 1
It is reasonable to assume that there has been a mutation in
Answer
To determine the likely location of a mutation, it is essential to analyze the inheritance pattern shown in the pedigree. In this case, the individuals in the generation descendents are exhibiting a changed allele not present in their parents, which suggests a mutation could have occurred.
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Both parents have chromosome R' alleles showing varied combinations in their offspring. This indicates that the mutation could most likely have originated due to an alteration in either parent's R' allele.
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Given that the individuals have options A and B referring specifically to chromosome R' (which shows variation), and options C and D referring to the R chromosome (which does not exhibit such variation), we can conclude:
Thus, the likely answer is B. chromosome R' of the father. This choice indicates an assumed mutation has taken place, leading to the observable differences in alleles in subsequent generations.