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Answer :
To determine the ratio of red to white flowering plants in the F2 generation, let's analyze the results from the Punnett square provided:
1. Genotypes from the Punnett Square:
- The Punnett square shows the possible combinations of alleles from two heterozygous parents (Rr x Rr).
- The combinations listed are:
- RR
- Rr (there are two occurrences of this)
- rr
2. Phenotype Explanation:
- Red Flowers: The genotype for red flowers includes both [tex]\(RR\)[/tex] and [tex]\(Rr\)[/tex]. This is because the presence of at least one dominant allele [tex]\(R\)[/tex] results in red flowers.
- White Flowers: The genotype for white flowers is [tex]\(rr\)[/tex], as it requires two recessive alleles (only this combination results in white flowers).
3. Counting Phenotypes:
- Red Flowers: There are 3 combinations that result in red flowers (1 RR and 2 Rr).
- White Flowers: There is 1 combination that results in white flowers (1 rr).
4. Resulting Ratio:
- This gives us a 3:1 ratio of red to white flowering plants.
Therefore, the horticulturalist would expect to see a phenotypic ratio of 3 red to 1 white in the F2 generation.
1. Genotypes from the Punnett Square:
- The Punnett square shows the possible combinations of alleles from two heterozygous parents (Rr x Rr).
- The combinations listed are:
- RR
- Rr (there are two occurrences of this)
- rr
2. Phenotype Explanation:
- Red Flowers: The genotype for red flowers includes both [tex]\(RR\)[/tex] and [tex]\(Rr\)[/tex]. This is because the presence of at least one dominant allele [tex]\(R\)[/tex] results in red flowers.
- White Flowers: The genotype for white flowers is [tex]\(rr\)[/tex], as it requires two recessive alleles (only this combination results in white flowers).
3. Counting Phenotypes:
- Red Flowers: There are 3 combinations that result in red flowers (1 RR and 2 Rr).
- White Flowers: There is 1 combination that results in white flowers (1 rr).
4. Resulting Ratio:
- This gives us a 3:1 ratio of red to white flowering plants.
Therefore, the horticulturalist would expect to see a phenotypic ratio of 3 red to 1 white in the F2 generation.
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