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Linkage Analysis
Medical Biochemistry 1
11
Medical
Graduate
11/22/2008

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Cards

Term
When are alleles "in coupling"
Definition
When they are linked and on the same chromosome
Term
When are alleles "in repulsion"
Definition
When they are on opposite chromosomes
Term
When to loci are farther apart, what does this do to their chance of recombination
Definition
increases it
Term
How is recombination frequency calculated?
Definition
= (# recombinants) / (Total # offspring)
Term
What is the maximum expected value for Recombination Frequency?
Definition
0.5
Term
Will a higher or lower recombination frequency indicate linkage between the marker and disease gene?
Definition
lower
Term
a 0.2 recombination frequency is translated into what genetic distance (cM)
Definition

20 centiMorgans

 

(each 1% RF corresponds to 1cM)

Term
Regarding 2 loci, what does a LOD score > 1 suggest?
Definition
the two loci are linked
Term

Regarding two loci, what does a LOD score < 1 suggest?

Definition
The two loci are unlinked
Term
What LOD score is taken as proof of linkage?
Definition
+3
Term
What LOD score is the threshold to consider 2 loci unlinked?
Definition
-2 or less
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