In tomatoes red fruit color is dominant to yellow and suppose a tomato plant homozygous for crossed with one yellowso determine the appearance of first filial?
Given:
- Red fruit color (R) is dominant to yellow fruit color (r).
- Homozygous red-fruited tomato plant (RR) is crossed with a homozygous yellow-fruited tomato plant (rr).
To determine:
- The appearance of the first filial generation (F1).
Solution:
When a homozygous red-fruited tomato plant (RR) is crossed with a homozygous yellow-fruited tomato plant (rr), the F1 generation will be heterozygous (Rr).
According to Mendel's law of dominance, the dominant trait (red fruit color) will be expressed in the F1 generation. Therefore, all the F1 plants will have red fruits.
The genotypic ratio in the F1 generation will be 1 RR : 2 Rr : 1 rr, but the phenotypic ratio (appearance) will be 3 red-fruited plants : 1 yellow-fruited plant.
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