We appreciate your visit to A horticulturalist wants to produce geraniums with specific characteristics She knows that the trait of red flowers is governed by the allele R RR and. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!
Answer :
To determine the expected ratio of red to white flowering plants in the F2 generation, follow these steps:
1. Understand the Genotypes:
- The trait for red flowers is controlled by the allele R. Plants with genotypes RR or Rr will have red flowers.
- The trait for white flowers is controlled by the allele r. Only plants with the genotype rr will have white flowers.
2. Setup a Punnett Square:
- We are crossing two geraniums from the F1 generation, both with the genotype Rr, which means each parent contributes either an R or an r allele to their offspring.
3. Fill Out the Punnett Square:
- The possible allele combinations from this cross are: Rr, Rr, rr, rr.
4. Determine the Phenotypes:
- From the combinations:
- Rr results in red flowers.
- rr results in white flowers.
5. Count the Phenotypes:
- There are two Rr combinations, which result in red flowers.
- There are two rr combinations, which result in white flowers.
6. Calculate the Phenotypic Ratio:
- There are 2 red-flowered plants to 2 white-flowered plants.
7. Simplify the Ratio:
- Simplifying the ratio 2 red : 2 white gives us 1 red : 1 white.
Based on this analysis, the expected ratio of red to white flowering plants in the F2 generation is not among the options provided, but rather 1 red to 1 white. The most closely resembling option from the list is 2 red to 2 white, showing two offspring for each color.
1. Understand the Genotypes:
- The trait for red flowers is controlled by the allele R. Plants with genotypes RR or Rr will have red flowers.
- The trait for white flowers is controlled by the allele r. Only plants with the genotype rr will have white flowers.
2. Setup a Punnett Square:
- We are crossing two geraniums from the F1 generation, both with the genotype Rr, which means each parent contributes either an R or an r allele to their offspring.
3. Fill Out the Punnett Square:
- The possible allele combinations from this cross are: Rr, Rr, rr, rr.
4. Determine the Phenotypes:
- From the combinations:
- Rr results in red flowers.
- rr results in white flowers.
5. Count the Phenotypes:
- There are two Rr combinations, which result in red flowers.
- There are two rr combinations, which result in white flowers.
6. Calculate the Phenotypic Ratio:
- There are 2 red-flowered plants to 2 white-flowered plants.
7. Simplify the Ratio:
- Simplifying the ratio 2 red : 2 white gives us 1 red : 1 white.
Based on this analysis, the expected ratio of red to white flowering plants in the F2 generation is not among the options provided, but rather 1 red to 1 white. The most closely resembling option from the list is 2 red to 2 white, showing two offspring for each color.
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