- #1
hivesaeed4
- 217
- 0
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?
Explaining the 9:3:3:1 phenotypic ratio genotypically?
- Thread starter hivesaeed4
- Start date
-
- Tags
- Ratio
Click For Summary
Discussion Overview
The discussion revolves around the explanation of the 9:3:3:1 phenotypic ratio observed in a dihybrid cross of pea plants, specifically whether this ratio can be understood in terms of genotypes. The scope includes conceptual clarification and technical explanation related to genetics.
Discussion Character
- Conceptual clarification, Technical explanation
Main Points Raised
- One participant notes the 9:3:3:1 ratio is reached using both a branch diagram and a Punnett square, suggesting a familiarity with the underlying genetic principles.
- Another participant questions the need for further explanation, asking for clarification on how dominance works in this context.
- A different participant asserts that the phenotypic ratio can indeed be explained genotypically by examining the genotypes corresponding to each phenotype, emphasizing the role of dominant alleles.
- One participant provides an image that includes both genotypes and phenotypes to aid understanding.
Areas of Agreement / Disagreement
Participants express varying levels of understanding and seek clarification, but there is no consensus on a singular explanation method for the genotypic basis of the phenotypic ratio.
Contextual Notes
Some assumptions about the participants' prior knowledge of genetic concepts, such as dominance and the use of Punnett squares, are present but not explicitly stated. The discussion does not resolve the complexity of explaining the ratio genotypically.
- #2
- 5,964
- 727
I'm not sure what you mean, how would you like it explained? Do you understand how dominance works?
- #3
hivesaeed4
- 217
- 0
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.
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
aroc91
- 181
- 5
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
mishrashubham
- 599
- 1
hivesaeed4 said:
Definitely Yes. Check what genotypes the one's with a particular phenotype have. Based on which allele is dominant you get the coressponding phenotype.
- #6
hivesaeed4
- 217
- 0
Thanks.
- #7
- 5,964
- 727
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)
Similar threads
- · Replies 6 ·
- · Replies 3 ·
- · Replies 1 ·
High School
What does 2:3 ratio mean? What does it show?
- · Replies 9 ·
- · Replies 20 ·