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
Both parents were homozygous.
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Answer
This statement is incorrect because parent 1 has a mix of RR and Rr in the Punnett square, indicating that at least one parent must be heterozygous.
Step 2
Both parents were heterozygous.
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Answer
This statement is also incorrect because parent 2 shows a homozygous genotype with at least one RR.
Step 3
Both parents had flowers of the same colour.
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Answer
This statement is true. Since the genotypes include RR which produces red flowers, both parents will have red flowers.
Step 4
Parent 2 must have red flowers and Parent 1 must have white flowers.
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Answer
This statement is incorrect since both parents exhibit the dominant phenotype of red flowers.
