For each offspring genotype in the Punnett square you just completed, determine the phenotype. In other words, what is the predicted fur color and eye color of the offspring? Using your Punnett square from the last step, fill in the predicted fraction for each phenotype in the data table below.
| | Black Fur and Black Eyes | Black Fur and Red Eyes | White Fur and Black Eyes | White Fur and Red Eyes |
|---|---|---|---|---|
| Predicted Fraction | | | | |
Answer (2)
Determine the number of offspring with each phenotype from the Punnett square.
Calculate the total number of offspring: 16.
Calculate the fraction of each phenotype: 16 9 , 16 3 , 16 3 , 16 1 .
Fill in the data table with these fractions: 16 9 (Black Fur and Black Eyes), 16 3 (Black Fur and Red Eyes), 16 3 (White Fur and Black Eyes), 16 1 (White Fur and Red Eyes).
Explanation
Analyze the problem and assume Punnett square results We need the Punnett square from the previous step to determine the genotypes and their corresponding phenotypes. Since I don't have access to that Punnett square, I will assume a hypothetical Punnett square result for demonstration purposes. Let's assume the following:
Black Fur and Black Eyes: 9 offspring
Black Fur and Red Eyes: 3 offspring
White Fur and Black Eyes: 3 offspring
White Fur and Red Eyes: 1 offspring
Calculate total number of offspring Now, we calculate the fraction of offspring for each phenotype. The total number of offspring is 9 + 3 + 3 + 1 = 16.
Calculate the fraction for each phenotype
Black Fur and Black Eyes: 16 9
Black Fur and Red Eyes: 16 3
White Fur and Black Eyes: 16 3
White Fur and Red Eyes: 16 1
Fill in the data table Finally, we fill in the data table with the calculated fractions.
Examples
Understanding phenotype ratios is crucial in breeding programs. For example, a farmer might want to breed animals with specific traits, like disease resistance or higher yield. By understanding the probabilities of different traits appearing in offspring, the farmer can make informed decisions about which animals to breed, maximizing the chances of getting the desired characteristics in the next generation. This is also applicable in understanding genetic diseases and predicting the likelihood of inheritance.
By analyzing a hypothetical Punnett square, we predicted the fractions of phenotypes for offspring's fur and eye colors as follows: 9/16 for Black Fur and Black Eyes, 3/16 for Black Fur and Red Eyes, 3/16 for White Fur and Black Eyes, and 1/16 for White Fur and Red Eyes. The total number of offspring is 16, leading to these fractions being filled in a data table. This exercise illustrates the importance of using a Punnett square to predict genotype and phenotype ratios in offspring.
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