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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,... show full transcript
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
To determine the heterozygous offspring from the given Punnett square, we need to identify the combinations of alleles resulting from the parental genotypes.
Analysis of the Punnett Square
- The square shows combinations of alleles:
- 1: BB (homozygous dominant)
- 2: Bb (heterozygous)
- 3: Bb (heterozygous)
- 4: bb (homozygous recessive)
Identifying Heterozygous Offspring
From the combinations:
- The offspring represented by the numbers 2 and 3 (Bb) are heterozygous.
- Now, we check the answer options:
- A. 1, 2 - Includes BB (not heterozygous)
- B. 1, 3 - Includes BB (not heterozygous)
- C. 2, 4 - Includes Bb and bb (only one heterozygous)
- D. 3, 4 - Includes Bb and bb (only one heterozygous)
Hence, the correct answer is C: 2, 4, which includes the heterozygous Bb offsprings.