Monk Mendel is working out in his garden planting yet more peas. He notices that

Question

Monk Mendel is working out in his garden planting yet more peas. He notices that the seeds he is removing from the pods are not the same color as the pod. Most of the green pods have green seeds, and most of the yellow pods have green seeds, but every once in a while there is a green pod with yellow seeds and a yellow pod with yellow seeds. Gregor decides that he will cross the plant green seeds from the green pod and yellow seeds from the yellow pod.

1. Is this a monohybrid or dihybrid cross ?

2. Which trait is dominant for seed color ?

3. Which trait is dominant for pod color ?

4. What are the parent phenotypes ?

5. What are the parent genotypes ?

6. Do the cross to find the F1 generation phenotypic ratio.

7. Choose 2 individuals from the F1 generation and allow them to self fertilize

Explanation / Answer

1. IT is a dihybrid cross 2. Green color is dominant for seed color 3. Yellow color is dominant for pod color 4. Parent phenotypes would be: Green seeds in green pods x yellow seeds in yellow pods 5. Parentgenotypes are: yyGG x YYgg 6. F1 genotype would be YyGg and phenotype would be yellow pods with green seeds 7. Selfing two F1 plants to give F2 would give the characteristic dihybrid ratio of 9:3:3:1

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