4.1.1 In the schematic representation above, identify the parent with a red phenotype - NSC Agricultural Sciences - Question 4 - 2019 - Paper 2
Question 4
4.1.1 In the schematic representation above, identify the parent with a red phenotype. Give a reason for the answer.
4.1.2 In the schematic representation above, id... show full transcript
Worked Solution & Example Answer:4.1.1 In the schematic representation above, identify the parent with a red phenotype - NSC Agricultural Sciences - Question 4 - 2019 - Paper 2
Step 1
Identify the parent with a red phenotype.
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Answer
The parent with a red phenotype is the female (Rr) from the parental generation. This is because the phenotype represented by the allele 'R' is red, which is dominant. Thus, the parent displaying the red phenotype must carry at least one 'R' allele.
Step 2
(a) The ratio of the phenotype in the F₂ generation.
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Answer
The ratio of the phenotype in the F₂ generation is 3:1, where 3 represents the red phenotype (RR and Rr) and 1 represents the black phenotype (rr).
Step 3
(b) The ratio of the genotype in the F₂ generation.
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Answer
The ratio of the genotype in the F₂ generation is 1:2:1, which includes 1 RR, 2 Rr, and 1 rr.
Step 4
(c) The phenotype of the F₁ generation.
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Answer
The phenotype of the F₁ generation is red, as all offspring from the cross of the parental generation (Rr x rr) will exhibit the dominant red phenotype.
