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, ... 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. Give a reason for the answer.
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Answer
The parent with a red phenotype is the female represented as 'Rr'. This is because red is the dominant color, represented by the allele 'R'. Therefore, the parent can pass on the 'R' allele to its offspring, resulting in red phenotypes.
Step 2
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 three offspring display the dominant red phenotype and one displays the recessive black phenotype. This reflects the typical ratio observed in Mendelian inheritance.
Step 3
The ratio of the genotype in the F2 generation.
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The ratio of the genotype in the F2 generation is 1:2:1, representing the genotypes RR (homozygous dominant), Rr (heterozygous), and rr (homozygous recessive) respectively. This is derived from a standard Punnett square.
Step 4
The phenotype of the F1 generation.
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The phenotype of the F1 generation is all red. This results from crossing the red parents (RR and Rr), where the dominant red color masks the recessive black phenotype.
