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Table 2 Two-sided model

From: Fractionation statistics

event

i

a

-7

-6

-5

-4

-3

-2

-1

0

1

2

3

4

5

6

7

8

r

start

  

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

 
   

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

 

1

-1

3

1

1

1

1

1

1

0

0

0

1

1

1

1

1

1

1

1

   

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

 

2

  

1

1

1

1

1

1

0

0

0

1

1

1

1

1

1

1

1,1

 

-4

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

 

3

4

4

1

1

1

1

1

1

0

0

0

1

1

0

0

0

0

1

1,1,1

   

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

 

4

  

1

1

1

1

1

1

0

0

0

1

1

0

0

0

0

1

3,1

 

-5

4

1

1

0

0

0

0

1

1

1

1

1

1

1

1

1

1

 
  1. Four deletion events affecting two homeologous chromosomes, leading to two runs of single-copy genes. The fourth step illustrates how further deletion (at i = –1) and the “skip” process (at i = 2) are blocked when a single-copy gene is encountered (i = –1) on the homeologous chromosome, truncating the geometric variable a.