Answer
First, I would cross homozygous white mice (WW) with homozygous brown mice (BB). If all the offspring have brown fur, it suggests Mendelian inheritance with complete dominance. However, if the offspring show a mix of white and brown fur, it indicates incomplete dominance.
Alternatively, I could cross heterozygous brown mice (WB) with each other. If the offspring exhibit a 1:2:1 ratio of white to intermediate to brown fur, it suggests incomplete dominance. But if all the offspring have brown fur, it suggests Mendelian inheritance with complete dominance. These crosses would provide insights into the mode of inheritance for the fur color alleles in mice.
Work Step by Step
Understanding the Objective: The goal is to determine whether the alleles for fur color in mice follow Mendelian inheritance (complete dominance) or exhibit incomplete dominance.
Recalling Mendelian Inheritance: In Mendelian inheritance, one allele is dominant over the other, resulting in a specific phenotype in the offspring.
Recalling Incomplete Dominance: In incomplete dominance, neither allele is completely dominant over the other, resulting in an intermediate phenotype in heterozygotes.
Considering Crosses: To distinguish between Mendelian inheritance and incomplete dominance, I considered specific crosses that would reveal the phenotypic ratios of the offspring.
Cross 1: Cross homozygous white mice (WW) with homozygous brown mice (BB). If all offspring have brown fur, it indicates Mendelian inheritance with complete dominance. If the offspring show a mix of white and brown fur, it suggests incomplete dominance.
Cross 2: Alternatively, cross heterozygous brown mice (WB) with each other. If the offspring exhibit a 1:2:1 ratio of white to intermediate to brown fur, it suggests incomplete dominance. If all the offspring have brown fur, it suggests Mendelian inheritance with complete dominance.
Analyzing Results: By observing the phenotypic ratios of the offspring in these crosses, I can determine whether the alleles for fur color in mice follow Mendelian inheritance or exhibit incomplete dominance.
Finalizing the Answer: Based on the outcomes of these crosses, I can confidently conclude whether the alleles for fur color in mice follow Mendelian inheritance (complete dominance) or exhibit incomplete dominance.
