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In tomatoes, red fruit (r) is dominant to yellow fruit (r). a true breeding red-fruited plant is bred to a true-breeding yellow-fruited plant. what phenotypic ratio would you expect to see in the f1 offspring?

Respuesta :

ALin03
We make a Punnett square. A red-fruited plant will have the genotype Rr or RR. Since it says "true-breeding", it would be RR. A yellow-fruited plant would have the genotype rr. Therefore, we cross RR and rr.

The result would give you 100% Rr, meaning that the phenotypic ration would be 4 red: 0 yellow
shivjimishraVT

When you cross a  true breeding red-fruited plant (RR) with a true-breeding yellow-fruited plant (rr), in the F1 generation, all the offspring have the phenotypes of the red-fruited plant. This is because red fruit (R) is dominant over yellow fruit (r).

What is Phenotype?

The Phenotype may be defined as the appearance or manifestation of the desired characters. It is also known as a trait.  

Since the allele of the red-fruited plant (R) is dominant over the allele of the yellow-fruited plant (r), the R masked the effect of r. So, in the F1 generation, the ratio of phenotypes is 4:0 where all the offspring have the alleles of red-fruited plants.

Therefore, when you cross a  true breeding red-fruited plant (RR) with a true-breeding yellow-fruited plant (rr), in the F1 generation, all the offspring have the phenotypes of the red-fruited plant. This is because red fruit (R) is dominant over yellow fruit (r).

To learn more about Phenotypic ratio, refer to the link:

https://brainly.com/question/22108809

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