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In a plant species, red flower colour (R) is dominant over white flower colour (r) - HSC - SSCE Biology - Question 15 - 2022 - Paper 1
Question 15
In a plant species, red flower colour (R) is dominant over white flower colour (r). Two plants of known genotype for flower colour were crossed. A punnet square was... show full transcript
Worked Solution & Example Answer:In a plant species, red flower colour (R) is dominant over white flower colour (r) - HSC - SSCE Biology - Question 15 - 2022 - Paper 1
Step 1
Which statement is true for the parents in this cross?
Answer
To determine the correct answer, we first need to analyze the genotypes of Parent 1 and Parent 2 as shown in the punnet square.
- Parent 1 has the genotype 'RR' for red flowers and 'Rr' in the punnet square, suggesting that it can be homozygous (RR) or heterozygous (Rr).
- Parent 2 has at least one 'R' and possibly combinations leading to 'RR' as shown.
Evaluating the options:
- A. Both parents were homozygous. This is incorrect because if Parent 1 has 'Rr', it is heterozygous.
- B. Both parents were heterozygous. This is incorrect because Parent 2 is likely homozygous (RR).
- C. Both parents had flowers of the same colour. This is true as 'RR' and 'Rr' both present red flowers since red is dominant.
- D. Parent 2 must have red flowers and Parent 1 must have white flowers. This is incorrect since Parent 1 can produce red flowers based on its genotype.
Therefore, the correct answer is C: Both parents had flowers of the same colour.