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Answer :
To determine the genotypic ratio of the resulting offspring from a cross between two agouti (BW) mice, let's follow these steps:
1. Defining the Traits:
- In this scenario, agouti coat color is codominant. This means that a mouse with a genotype of BW will show both black (B) and white (W) traits.
2. Setting Up the Cross:
- We are crossing two agouti mice, each with the genotype BW.
- To find out the possible genotypes of their offspring, we use a Punnett square.
3. Punnett Square:
- List the genotypes of each parent along the top and side of the Punnett square.
- The alleles from one parent (BW) go across the top, and the alleles from the other parent (BW) go down the side.
| | B | W |
|---|---|---|
| B | BB| BW|
| W | BW| WW|
4. Interpreting the Squares:
- BB: One square results in BB.
- BW: Two squares result in BW (from B x W and W x B).
- WW: One square results in WW.
5. Counting the Genotypes:
- BB: 1 (from B x B)
- BW: 2 (from B x W and W x B)
- WW: 1 (from W x W)
6. Genotypic Ratio:
- The ratio of the genotypes BB:BW:WW is 1:2:1.
The genotypic ratio of the resulting offspring from crossing two agouti (BW) mice is:
1 BB : 2 BW : 1 WW
This detailed step-by-step explanation provides a clear understanding of how we arrived at the genotypic ratio.
1. Defining the Traits:
- In this scenario, agouti coat color is codominant. This means that a mouse with a genotype of BW will show both black (B) and white (W) traits.
2. Setting Up the Cross:
- We are crossing two agouti mice, each with the genotype BW.
- To find out the possible genotypes of their offspring, we use a Punnett square.
3. Punnett Square:
- List the genotypes of each parent along the top and side of the Punnett square.
- The alleles from one parent (BW) go across the top, and the alleles from the other parent (BW) go down the side.
| | B | W |
|---|---|---|
| B | BB| BW|
| W | BW| WW|
4. Interpreting the Squares:
- BB: One square results in BB.
- BW: Two squares result in BW (from B x W and W x B).
- WW: One square results in WW.
5. Counting the Genotypes:
- BB: 1 (from B x B)
- BW: 2 (from B x W and W x B)
- WW: 1 (from W x W)
6. Genotypic Ratio:
- The ratio of the genotypes BB:BW:WW is 1:2:1.
The genotypic ratio of the resulting offspring from crossing two agouti (BW) mice is:
1 BB : 2 BW : 1 WW
This detailed step-by-step explanation provides a clear understanding of how we arrived at the genotypic ratio.
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