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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 produced from the cross between plants that always produce yellow pods (AA) and plants that always produce green pods (aa), we observe that the dominant allele for yellow pods is A. Therefore, all offspring from this cross will inherit an A allele from the yellow pod parent and an a allele from the green pod parent, resulting in the genotype Aa. Thus, the answer is C (Aa).
Step 2
Give this ratio in its simplest form.
Answer
To calculate the ratio of yellow to green pea pods produced from the second cross, we note that out of 5,496 yellow pods and 1,832 green pods, the ratio is:
This simplifies by dividing both numbers by their greatest common divisor (GCD). The GCD of 5496 and 1832 is 16. Thus, we can simplify the ratio:
Therefore, the ratio of yellow to green pea pods in its simplest form is 343:114.