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The chance that individual III–3 is Pp with regard to the PKU locus is A - VCE - SSCE Biology - Question 14 - 2008 - Paper 1
Question 14
The chance that individual III–3 is Pp with regard to the PKU locus is A. 1/3 B. 1/2 C. 2/3 D. 3/4
Worked Solution & Example Answer:The chance that individual III–3 is Pp with regard to the PKU locus is A - VCE - SSCE Biology - Question 14 - 2008 - Paper 1
Step 1
The chance that individual III–3 is Pp with regard to the PKU locus is
Answer
To determine the probability that individual III–3 is genotype Pp regarding the PKU locus, we need to analyze the inheritance pattern in the pedigree.
Assuming we know the genotypes of the parents and the possible offspring combinations, we can utilize a Punnett square for a monohybrid cross. If we consider the parents' genotypes:
- If one parent is homozygous recessive (pp) and the other parent is heterozygous (Pp), the potential offspring genotypes would be as follows:
- 50% Pp (heterozygous)
- 50% pp (homozygous recessive)
In this scenario, individual III–3 has a 50% chance of being Pp. Hence, the answer is:
B. 1/2