The illustration below shows a crossing between a black bull (B) and a white cow (W) - NSC Agricultural Sciences - Question 4 - 2023 - Paper 2
Question 4
The illustration below shows a crossing between a black bull (B) and a white cow (W).
P1
BB X WW
Process 1
Gametes
B ... show full transcript
Worked Solution & Example Answer:The illustration below shows a crossing between a black bull (B) and a white cow (W) - NSC Agricultural Sciences - Question 4 - 2023 - Paper 2
Step 1
4.1.1 Identify the pattern of inheritance in the diagram above.
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Answer
The pattern of inheritance represented in the diagram is incomplete dominance. This means that neither allele (black or white) fully dominates, resulting in an intermediate phenotype (grey) in the F1 generation.
Step 2
4.1.2 Justify the answer to QUESTION 4.1.1.
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Answer
The justification for identifying incomplete dominance is observed in the F1 generation where the offspring (BW) exhibit a grey color, which is a blend of the black and white parental traits.
Step 3
4.1.3 Label each of the following represented in the diagram above:
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Answer
(a) Process by 1: Meiosis
(b) Genotype by 2: BW
(c) Phenotype by 3: Black
Step 4
4.1.4 Write down each of the following:
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Answer
(a) Genotypic ratio of the F1-generation: 1 BW
(b) Phenotypic ratio of the F2-generation: 1 black : 2 grey : 1 white
