Explaining the 9:3:3:1 phenotypic ratio genotypically?

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SUMMARY

The discussion centers on the explanation of the 9:3:3:1 phenotypic ratio observed in a dihybrid cross of pea plants, specifically using the Punnett square method. Participants confirm that the ratio can be understood genotypically by analyzing the dominant and recessive alleles involved, namely R, r, Y, and y. The Punnett square serves as a probability map that illustrates the genotypic possibilities leading to the specified phenotypic outcomes. Visual aids, such as diagrams showing both genotypes and phenotypes, enhance comprehension of the genetic principles at play.

PREREQUISITES
  • Understanding of Mendelian genetics
  • Familiarity with Punnett squares
  • Knowledge of dominant and recessive alleles
  • Basic grasp of dihybrid crosses
NEXT STEPS
  • Study the principles of Mendelian inheritance
  • Explore advanced Punnett square applications in genetic predictions
  • Investigate the concept of epistasis and its effects on phenotypic ratios
  • Learn about genetic variation and its implications in plant breeding
USEFUL FOR

Students of genetics, educators teaching Mendelian principles, and plant breeders seeking to understand phenotypic ratios in hybridization.

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In a dihybrid cross of let's say pea plants we get the famous 9:3:3:1 phenotypic ratio. Could this phenotypic ratio be explained genotypically?
 
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I'm not sure what you mean, how would you like it explained? Do you understand how dominance works?
 
Yes I know how dominance works.

I reached the 9:3:3:1 by the branch diagram as well as by using the punnett square.

As far as "how would you like it explained?"

Well frankly any way possible. Just try to make it easy to understand.

Thanks.
 
If you reached the 9:3:3:1 using a Punnett square, then I don't see the issue. A Punnett square is a probability map of all the genotypic possibilities.
 
hivesaeed4 said:
In a dihybrid cross of let's say pea plants we get the famous 9:3:3:1 phenotypic ratio. Could this phenotypic ratio be explained genotypically?

Definitely Yes. Check what genotypes the one's with a particular phenotype have. Based on which allele is dominant you get the coressponding phenotype.
 
Thanks.
 
Hopefully this image will help, it has both the genotypes (with the alleles R, r, Y and y) and the phenotypes (Round, wrinkled, Yellow, green)

23v0tqx.gif
 

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