TABLE A1

Tetrad classification

ClassTypeJRP3′ markerIncidentalsKY48 + KY49KY51 + KY52
1j + h4:42841
2f4:43626
3gII4:482
4gIII4:452
5j + h4:4I97
f4:4(1)
6j + h4:4III10
gIII(III)
7iII4:442
8iII4:4I or II11
gII(I)
9gII4:4I30
iII(I)
10 omitf4:4II10
iII(II)
11 omitj + h4:4I + III30
f(I) + III
gIIII + (III)
12iIII4:420
13 omitj + h4:4I + III10
gIII4:4I + (III)
f4:4(I) + III
14 omitf4:4III10
iIII4:4(III)
15gII4:4(III)10
16 omitj + hII4:4II + III10
gIII4:4II + (III)
17iII4:4(III)20
18iII4:4III10
19f4:4I12
20gII4:4II10
21gIII4:4I01
iIII4:4(I)
22gII4:4III01
23gII4:4I01
iII(I)
24 omitj + h4:4I + II01
f(I) + II
iII(I + II)
25 omitiIII4:4III01
f(III)
gIII(I)
26iII4:4I + (III)01
27iII4:4I01
28iII4:4III01
29j + h4:44810
30f4:4488
31gII4:444
32gIII4:471
33j + h4:4I144
f(I)
34j + h4:4III40
gIII(III)
35iII4:440
36iII4:4I30
gII(I)
iIIII
37iII4:4(I)10
gIII
38gII4:4III20
39f4:4III10
iIII4:4(III)
40 omitj + h4:4II + III10
gII(II) + III
41f4:4I20
42gII4:4I + (III)10
iII(I + III)
43f4:4II + III10
44iIII4:4II10
45 omitiII4:4II + (III)10
f(II + III)
iIII(II + III)
gII(I + III)
46iII4:4(III)10
47gII4:4(III)01
48gIII4:4I + II01
49j + hFC32
50fFC82
51gIIIFC141
52gIIIFCII10
53j + hFCI30
f(I)
54j + hFCIII10
gIII(III)
55iIIIFC30
56gIIIFCI + II + III10
57 omitiIIIFCIII40
f(III)
gIII(I)
58 omitfFCIII10
iIII(III)
59gIIIFCI10
iIII(I)
60iIIIFCI10
61-80Discontinuous conversion
81j + hHC028
82fHC019
83gIIIHC013
84j + hHCI04
f(I)
85j + hHCII01
86j + hHCIII02
gIII(III)
87iIIIHC03
88gIIIHCI01
89 omitiIIIHC(III)01
fIII
90fHCI01
91 (omit)j + hHCI + II + (II)01
f(I + II + II)
92fHC(II)01
93j + hFC73
94fFC33
95gIIIFC97
96j + hFCI20
f(I)
97gIIIFC(II)10
98iIIIFC30
99gIIIFCI10
iIII(I)
100iIIIFC(II)20
101gIIIFCI01
102-112Discontinuous conversion
113j + hHC021
114fHC019
115gIIIHC010
116j + hHCI05
f(I)
117j + hHCIII01
gIII(III)
118iIIIHC04
119 omitiIIIHCIII01
f(III)
gIII(I)
120gIIIHCI02
121fHCIII01
122gIIIHCII01
123-309Not HC at his4-IR9
  • Tetrads were assigned to type on the basis of the smallest number of events (“events” are conversions with or without exchange plus incidental exchanges) required to generate them. When two assignments are possible by this criterion, both are entered. When incidental interval entry is in parentheses, the exchanges have involved the PMS chromatid. Tetrad classes that have two or more incidental exchanges were omitted from the calculations of Tables 3 and 4, as were tetrads in which more than two assignments could be made. Tetrads that are ambiguous were omitted from those calculations as well, with the following exceptions: in Tables 3 and 4 the types called g/i are those tetrads that are ambiguously g or i; tetrads that, because of incidental exchanges, were scored ambiguously as j + h and either f or g were considered to be j + h. There are three factors that argue for that assignment: (1) there are twice as many ways to create a tetrad that looks like a j + h with an incidental exchange as there are to create an f or a g that appears to have had an incidental exchange involving the PMS chromatid; (2) the j + h class is larger than either the f or g class; (3) chiasma interference, if any, will discourage incidental exchanges in the f and g classes. Tetrad classes not used in Tables 3 and 4 are marked “omit.” Except for tetrad class 64, “discontinuous conversion” means that the 5′ and the 3′ his4 markers were converted in opposite directions.