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If individuals I12 and I17 married, the chance that their first child would have the trait is A - VCE - SSCE Biology - Question 9 - 2011 - Paper 1
Question 9
If individuals I12 and I17 married, the chance that their first child would have the trait is A. zero. B. one in two. C. one in three. D. one in four.
Worked Solution & Example Answer:If individuals I12 and I17 married, the chance that their first child would have the trait is A - VCE - SSCE Biology - Question 9 - 2011 - Paper 1
Step 1
Step 2
Genotype analysis of individuals I12 and I17
Answer
Assuming the trait is recessive, if both parents are carriers (heterozygous) or if one is affected (homozygous recessive), we can derive the probabilities accordingly. We should create a Punnett square for the different crosses that may arise from these genotypes.
Step 3
Calculate the probability
Answer
Base the calculation on the potential combinations arising from the genotypes of I12 and I17. If both are carriers, the likelihood of the child having the trait would be 25%, which corresponds to one in four. Thus, the chance that their first child would have the trait is D. one in four.