The presence of freckles is a dominant characteristic - HSC - SSCE Biology - Question 5 - 2011 - Paper 1
Question 5
The presence of freckles is a dominant characteristic. A child's mother has no freckles and its father is heterozygous for freckles.
What is the probability that th... show full transcript
Worked Solution & Example Answer:The presence of freckles is a dominant characteristic - HSC - SSCE Biology - Question 5 - 2011 - Paper 1
Step 1
Identify the genotypes
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Answer
The mother's genotype is homozygous recessive (ff) since she has no freckles. The father's genotype is heterozygous (Ff) as he has freckles.
Step 2
Set up a Punnett square
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Answer
To find the probability of their child inheriting freckles, we can set up a Punnett square:
F f
--------------
f | Ff | ff |
f | Ff | ff |
Step 3
Analyze the results
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Answer
From the Punnett square, we see that there are 2 combinations (Ff) that result in freckles (dominant) and 2 combinations (ff) that result in no freckles (recessive). Therefore, the probability of the child having freckles is:
Probability = ( \frac{2}{4} = 50% )
Step 4
Conclusion
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Answer
Thus, the answer to the question is 50%. The correct option is (B) 50%.
