Íslenskar landbúnaðarrannsóknir - 01.03.1970, Blaðsíða 68

66 ÍSLENZKAR LANDBTJNAÐARRANNSÓKNIR
TABLE 26
Cotnparisons of segregation ratios in reciprocal matings
with n^20 in both matings
Matings Sire x Dam Dam x Sire Rec. mat. added Hetero- geneity
n DF X1 2 n DF X2 n DF X2 DF X2
A1A2 X A1A5 33 1 0.0909 33 1 0.8182 66 1 0.1818 1 0.7273
AiA2 X a5a5 106 1 0.0377 48 1 0.7500 154 1 0.1039 1 0.6838
AiA5 x a5a5 179 1 2.0168 103 1 3.5049 282 1 0.0000 1 5.5217*
A2A4 x a5a5 39 1 0.0256 27 1 0.3333 66 1 0.0606 1 0.2983
AoA5 x a5ab 121 1 4.3719* 120 1 3.3333 241 1 7.6722** 1 0.0330
A4A5 X A5A5 57 1 0.1579 25 1 1.9600 82 1 0.1951 1 1.9228
Sum 535 6 6.7008 356 6 10.6997 891 6 8.2136 6 9.1869
*) P < 0.05; **) PCO.Ol
TABLE 27
-g2’s in added reciprocal matings when grouped according to presence
or absence of allele Ax
Mating1) DF X2 Probability
AiA- x AiA, 3 0.2644 0.98 > P > 0.95
AjAj X AkAj AtAj X AkAj2) A2A5 X a5a5 13 6.5664 0.95 > P > 0.90
11 8.3326 0.70 > P > 0.50
1 7.6722 0.01 >P> 0.001
Sum 28 22.8356
1) i, j, k, 1>1
2) A2A5 x A5A5 excluded
0.90 > P > 0.80) and Lauvergne obtained
129 white and 45 black progeny out of the
sarne mating (x2i = 0.0689; 0.80>P>
0.70), while Hayman and Cooper obtain-
ecl a x2i= 0-0136 (0.95 > P > 0.90) wlien
comparing observed numbers o£ white and
nonwhite with those expected in a white
flock segregating for nonwhite colour.
Davenport (1905) on the other hand ob-
tained 40 white and 7 black out of the
same type of mating (x2i = 2.5603; 0.20 >
P>0.10).
Tliis indication of subnormal variation
in segregation ratios from matings involv-