Dihybrid Punnett Square Practice Problems Directions: Answer the questions that follow in your science notebook. For a particular plant, the allele for tall (T) is dominant over the allele for short (t). For the same plant, the allele for colored flowers (G is dominant over white flowers (c). A farmer as shown in the Punnett
The Correct Answer and Explanation is :
In this dihybrid cross problem, we are examining two traits in a particular plant species: height and flower color. The allele for tall plants (T) is dominant over the allele for short plants (t), and the allele for colored flowers (G) is dominant over the allele for white flowers (c). The farmer has provided a Punnett square to illustrate the cross between two hybrid plants.
Understanding the Punnett Square:
A Punnett square is a tool used to predict the genotypes and phenotypes of offspring resulting from a genetic cross. In this case, the Punnett square represents a dihybrid cross, which involves two traits. Each parent contributes one allele for each trait, leading to a combination of alleles in the offspring.
Analyzing the Provided Punnett Square:
The Punnett square provided by the farmer likely shows the possible combinations of alleles for the two traits. Each box within the square represents a potential genotype for an offspring. By examining the distribution of dominant and recessive alleles, we can determine the expected phenotypic ratios of the offspring.
Expected Phenotypic Ratios:
Based on Mendelian genetics and the dominance relationships provided, we can predict the phenotypic ratios of the offspring. Typically, a dihybrid cross between two heterozygous individuals (TtGg x TtGg) results in a 9:3:3:1 phenotypic ratio:
- 9/16 Tall plants with colored flowers
- 3/16 Tall plants with white flowers
- 3/16 Short plants with colored flowers
- 1/16 Short plants with white flowers
Conclusion:
By analyzing the provided Punnett square, we can determine the expected genotypic and phenotypic ratios of the offspring resulting from the cross between the two hybrid plants. This analysis demonstrates the application of Mendelian principles in predicting genetic outcomes.
Note: The specific details of the Punnett square are not provided in the available information, so the analysis is based on standard Mendelian ratios for a dihybrid cross.