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------------------------------------------------ The following question refers to the pedigree chart in Figure 14.2 for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle.

What is the genotype of individual II-5?

A. WW
B. Ww
C. ww
D. WW or ww
E. ww or Ww

Individual II-5 must possess at least one dominant allele since they exhibit the trait without the disorder, indicating the genotype could be Ww or WW.

Explanation:

The question pertains to a pedigree chart in which individuals exhibiting a dominant trait (W) are represented by shaded symbols. Since we're asked to determine the genotype of individual II-5, we should look for the inheritance pattern illustrated in the pedigree and the genotypes given in the question details. In the case presented, we are told that individuals affected by a disorder have the genotype aa while unaffected individuals are A?, and unaffected individuals must possess at least one dominant allele (A). Bearing this in mind, if individual II-5 is unaffected, they cannot have the genotype ww as this would indicate they express the disorder. Instead, II-5 must be heterozygous Ww or homozygous dominant WW, because they exhibit the dominant trait without presenting the disorder, which in this case, the recessive allele is responsible for.

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