The information in pedigrees that is useful for mapping disease genes is sometimes limited. This pedigree shows segregation of neurofibromatosis, which is a fully-penetrant, autosomal dominant condition, and a single nucleotide polymorphism, SNP1, which has alleles G or T. Why is the cross in generation I not useful for determining the degree of linkage between the disease-causing gene NF and SNP1?

Would really appreciate it, i have an idea but not completely sure

Researchers randomly divide participants into groups. each group takes a different amount of omega-3 fatty acid supplements daily for a month. one group receives a placebo. the researchers measure the impact on cholesterol levels in the blood. what is the purpose of random assignment in this experiment? a, to produce treatment groups with similar characteristics b, to ensure that all people with high cholesterol have an equal chance of being selected for the study c, to increase the accuracy of the research results and prevent skewness in the data

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