Articles written in Journal of Genetics
Volume 6 Issue 3 April 1917 pp 231-235
Volume 8 Issue 4 September 1919 pp 209-258
Volume 9 Issue 1 December 1919 pp 53-60
Volume 9 Issue 4 March 1920 pp 339-346
Volume 10 Issue 2 August 1920 pp 135-140
Volume 11 Issue 2 September 1921 pp 123-139
Volume 11 Issue 3 December 1921 pp 277-292
It is contended that the evidence advanced by Cockayne is not sufficient to deny segregation in the Mendelian sense, in crosses between
The experiments reported show that in the
The great variation in the buff coloured hybrids is probably due to the effects of modifying genes. The colour of these buff insects as well as that of the others was measured in the tintometer. The construction of distribution curves in the manner previously described enables the segregation of these variable insects to be followed without difficulty.
Segregation is found to take place in the
The crosses between the
The statement that var.
Volume 11 Issue 3 December 1921 pp 293-298
The observations of Hamling and Harris seemed to show that although the factor for melanism in
Nevertheless, a repetition of their work shows a ratio of type to melanic in the first broods, very closely approaching the equality expected.
In another set of matings, which produced the second broods, the mortality for various reasons was over 75%. In this case, as in the experiments of Hamling and Harris, the ratio was nearer 3 melanic to 1 type than equality. This suggests that there may have been a selective mortality in favour of the melanic insects, which disturbs the normal ratio.
That a certain constitutional strength seems to accompany many melanic forms has been pointed out by other authors, and attention is here drawn to the fact that this would account more easily than other hypothesis for the rapid replacement of type by melanic varieties.
Volume 12 Issue 1 April 1922 pp 91-99
The peculiar ticking which causes the coat pattern known as “steel” in Dutch rabbits may be represented as a heterozygous character.
The factor for this character, called
The data show that blacks extracted from steels, and therefore homozygous for
There is some evidence to show that there may be more than one type of agouti, for two agouti males were used, which when mated to steels gave equal numbers of steel and agouti, but when mated to extracted blacks, one gave nothing but steel, the other both steel and agouti. On this point, further investigations are being made.
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