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A Punnett square is shown - HSC - SSCE Biology - Question 3 - 2023 - Paper 1
Question 3
A Punnett square is shown. B b B 1 2 B 3 4 Which of the following options represents heterozygous offspring? A. 1, 2 B. 1, 3 C. 2, 4 D. 3, 4
Worked Solution & Example Answer:A Punnett square is shown - HSC - SSCE Biology - Question 3 - 2023 - Paper 1
Step 1
Which of the following options represents heterozygous offspring?
Answer
In a Punnett square, heterozygous offspring are characterized by having one dominant and one recessive allele. In this case, the alleles are represented as 'B' (dominant) and 'b' (recessive).
Inspecting the Punnett square:
- Cell 1 (BB): Homozygous dominant
- Cell 2 (Bb): Heterozygous
- Cell 3 (Bb): Heterozygous
- Cell 4 (bb): Homozygous recessive
The offspring that are heterozygous in this Punnett square are represented by cells 2 (Bb) and 3 (Bb). Therefore, the correct option is C: 2, 4, which corresponds to the heterozygous offspring.