Final answer:
The expected ratio of F2 offspring in the F1 generation can be calculated using the principles of inheritance. By considering each trait independently, we can determine the ratio of the different phenotypes. In this case, the correct answer is 9 'fabulous':7 'plain'.
Step-by-step explanation:
The expected ratio of the F2 offspring of the F1 generation can be determined using the principles of inheritance. In this case, we have a dihybrid cross with seed color and seed texture. By applying the product rule and considering each trait independently, we can calculate the expected ratios. Ignoring seed color, we would expect three-quarters of the F2 offspring to have round seeds and one-quarter to have wrinkled seeds. Ignoring seed texture, we would expect three-quarters to have yellow seeds and one-quarter to have green seeds. Therefore, the correct answer among the options provided is 1) 9 'fabulous':7 'plain'.