Reference no: EM1359904
Linkage disequilibrium and LOD score
1. Gene A has two alleles, A1 and A2. Gene B has two alleles, B1 and B2. In a population, the following haplotype frequencies were observed: A1B1 = 0.2, A2B2 = 0.45, A1B2 = 0.15 and A2B1 = 0.2. Calculate the extent of linkage disequilibrium.
2. Assume the disease genotype is known, as A is the disease allele and a is the normal allele. The marker has four alleles (1, 2, 3,4).
a. How many meiosis do we see in the pedigree?
b. How many meiosis are informative for linkage analysis
c. Calculate the LOD score assuming the genetic distances are 10 and 20 cM.
3. This pedigree has 5 children. The assumption is the same as in question 2.
b. What is the LOD score at genetic distance 50 cM
c. What is the maximum LOD score?
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