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Gregor Mendel studied inheritance in pea plants - Edexcel - GCSE Biology - Question 1 - 2022 - Paper 1
Question 1
Gregor Mendel studied inheritance in pea plants. Pea plants can produce either yellow pea pods or green pea pods. Mendel crossed plants that always produce yellow ... show full transcript
Worked Solution & Example Answer:Gregor Mendel studied inheritance in pea plants - Edexcel - GCSE Biology - Question 1 - 2022 - Paper 1
Step 1
Which is the genotype of the pea pods produced from this cross?
Answer
To determine the genotype of the pea pods, we recognize that yellow pea pod production is associated with the dominant allele, A. The cross between plants that always produce yellow pods (AA) and those with green pods (aa) results in offspring with the genotype Aa. Thus, the correct answer is: A.
Step 2
Give this ratio in its simplest form.
Answer
In the second cross, we have 5,496 yellow pea pod plants and 1,832 green pea pod plants. To find the ratio of yellow to green, we can express this as:
ext{Ratio} = rac{5496}{1832}
Calculating this ratio, we divide both numbers by their greatest common divisor (GCD). The GCD of 5496 and 1832 is 4, so:
ext{Ratio} = rac{5496 ext{ ÷ } 4}{1832 ext{ ÷ } 4} = rac{1374}{458}
Dividing again by the GCD which is 2:
ext{Ratio} = rac{687}{229}
Thus, the simplest form of the ratio of yellow to green pea pods is 687:229.