Íslenskar landbúnaðarrannsóknir - 01.03.1970, Blaðsíða 66

64 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
TABLE 24
Segregation of A2 and A5 alleles from individual heterozygous grey sires
when mated to A5A5 ewes
Sire Progeny showing allele
A2 Ar, Total, n DF X2
01035 9 19 28 1 3.5714
01072 1 1 2 1 0.0000
01530 0 5 5 1 5.0000
05031 11 9 20 1 0.2000
05041 3 3 6 1 0.0000
06024 3 9 12 1 3.0000
07036 1 0 1 1 0.5000
08011 2 5 7 1 1.2857
08017 6 5 11 1 0.0909
12014 7 4 11 1 0.8181
14053 2 2 4 1 0.0000
15007 1 2 3 1 0.3333
16072 3 8 11 1 2.2727
13 17.0721
All sires 49 72 121 1 4.3719*
Heterogeneity 12 12.70021)
6 9.9531
Sires with n > 10 39 54 93 1 2.4194
Heterogeneity 5 7.53372)
*) P < 0.05
1) 0.50 > P > 0.30
2) 0.20 > P > 0.10
q show significant deviations from 1.0 for
the parameter c2 only and nearly signi-
ficant deviations for parameters a2 and b2.
The significances of these deviations
could not have been demonstrated con-
vincingly by an ordinary x2-test of the
segregation ratios. This is seen from table
19, where the total ^2 for all matings with
140 DF is 125.348. The corresponding x2
for matings with n g 20 with 30 DF is
37.566, none of these being signiiicant.
When the reciprocal mating are added
the corresponding ^2’s are actually rather
below expectation, and so give no indica-
tion of the disturbed ratios in matings
where the A2-allele is segregating.
The low obtained for the remainder
after estimation of the parameters in add-