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Biology
Posted 10 months ago
predict the results of a monkhybrid cross involving dominant, co-dominant and incomplete dominant traits
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Answer from Sia
Posted 10 months ago
Answer
To predict the results of a monohybrid cross involving dominant, co-dominant, and incomplete dominant traits, we need to understand the genotypes of the parents and apply the principles of Mendelian inheritance.
Solution
a
Determine the genotypes of the parents for the trait in question. For a dominant trait, the dominant allele is represented by a capital letter (e.g., "A") and the recessive allele by a lowercase letter (e.g., "a"). For co-dominant and incomplete dominant traits, different capital letters are used to represent the different alleles (e.g., "R" and "W")
b
Set up a Punnett square to predict the offspring's genotypes. Place the alleles of one parent on the top and the alleles of the other parent on the side of the square
c
Fill in the Punnett square by combining the alleles from each parent to form the possible genotypes of the offspring
d
Analyze the Punnett square to determine the phenotypic ratios. For dominant traits, any offspring with at least one dominant allele will display the dominant phenotype. For co-dominant traits, offspring with both alleles will express both phenotypes simultaneously. For incomplete dominance, offspring with one allele of each type will display a blend of the two parental phenotypes
Key Concept
Mendelian inheritance and Punnett squares are essential tools for predicting the outcomes of genetic crosses.
Explanation
By understanding the genotypes of the parents and the mode of inheritance (dominant, co-dominant, incomplete dominance), we can use a Punnett square to predict the possible genotypes and phenotypes of the offspring.

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