Íslenskar landbúnaðarrannsóknir - 01.03.1970, Blaðsíða 98

96 ÍSLENZKAR LANDBÚNAÐARRANNSÓKNIR
TABLE 55
Segregcition at the B-locus from matings ivith knoivn genotypes of both parents
Mating Males Females Both sexes
Sire Dam Bl.i) Br. Total Bl. Br. Total Bl. Br. Total
BiBx x BiB2 9 0 9 7 0 7 16 0 16
BiBi x B2Bo 22 0 22 22 0 22 44 0 44
BiB2 X BiBi 0 0 0 1 0 1 1 0 1
BiB2 x b,b2 18 8 26 11 5 16 29 13 42
BiB2 x b2b2 14 12 26 25 16 41 39 28 67
B2B2 X B1B2 8 8 16 11 12 23 19 20 39
B2B2 X B2B2 0 28 28 0 33 33 0 61 61
Sum .... 71 56 127 77 66 143 148 122 270
1) Bl. = black pigment. Br. = brown pigment.
TABLE 56
Comparison of observed with expected frequencies at the B-locus
Mating Sire Dam Males Females Both sexes Fleterogeneity
DF X2 DF X2 DF X2 DF X2
BiB2 x BiB2 1 0.462 1 0.333 1 0.794 1 0.001
BiB2 x b2b2 1 0.154 1 1.976 1 1.806 1 0.324
B2B2 X B1B2 1 0.000 1 0.049 1 0.025 1 0.018
Sum .... 3 0.616 3 2.352 3 2.625 3 0.343
only given rise to 7 progeny. From tlie reci-
procal mating, S2S2 X S^S^, altogether 109
progeny have been obtained, 56 males and
53 females. The obtained frequencies of
progeny without and with white markings
agree closely with those expected, giving
the following x2’s: í°r niales, x2i = 0.071,
for females x2i = 0.472 and for both sexes
X2! = 0.083. None of these is significant.
lt must be emphasized in connection
with the results in table 57 that the varia-
tion in the extent of the white markings
in the homozygotes is enormous. In table
58 are shown the types of white markings
of progeny sliowing white markings in
table 57 classified according to the nume-
rical code used for describing the extent
of wliite markings of each individual
shown on p. 18.
As table 58 shows, the variation in the
extent of the white markings is almost con-
tinuous, from code number 10, dark eye