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

  • Thread starter hivesaeed4
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  • #1
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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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  • #2
Ryan_m_b
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I'm not sure what you mean, how would you like it explained? Do you understand how dominance works?
 
  • #3
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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.
 
  • #4
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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.
 
  • #5
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.
 
  • #7
Ryan_m_b
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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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