In radishes, red and white are pure-breeding colors, while the hybrids are purple. if av red radish is crossed with a white raddish, what will be the phenotype of the f2 generation
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Ответ:
Rr no matter how times your cross the parents! Why? Because the red radish can only give one type of allele R, and the white can only give r to its progeny, thus all the radishes in your f1 (first generation progeny) will always be Rr, which is a hybrid that looks purple.
The f2 essentially means you've crossed your f1 generation together, and we already said that they will ALL be Rr; so we know you're going to cross Rr x Rr.
Rr x Rr yields a ratio of :
1 RR: 2 Rr: 1 rr (25%, 50%, 25%).
Now convert these genotypes to phenotypes and you've got your answer.
Ответ:
atmo is air
geo is rocks
bio is earth