M. S. Pease
Articles written in Journal of Genetics
Volume 11 Issue 3 December 1921 pp 235-240
Volume 15 Issue 3 July 1925 pp 375-412
Volume 16 Issue 3 April 1926 pp 363-385
There are two independent factors,
The Heart character shows “linkage” with a number of other characters. Clearly it is of interest to determine, in each case, whether linkage is with the factor
There is one linkage group comprising the factors
There is a second linkage group containing the factors
There are two so far unattached factors, one of which,
Thus the ten factors so far considered account for four of the nine chromosomes of
Volume 17 Issue 3 January 1927 pp 253-267
The swollen stem (or so-called bulb) of the Kohl Rabi is determined by three multiple factors, of which two are major and the third is a minor or modifying factor. This conclusion is arrived at from a consideration of the distribution of types in
Intermediate, or Semi-bulb, types have been selected and shown to breed true
The purple colour in the “blue” Kohl Rabi is due to two complementary factors
One of the major factors which controls the bulb in the Kohl Rabi is linked to the factor
Volume 18 Issue 2 June 1927 pp 207-218
The “pied” character, a mixture of coloured, particoloured and pure white feathers (such as occurs in the Exchequer Leghorn), behaves as a simple recessive to self-coloured plumage. Pied chicks show a great deal more white in the down than normal blacks.
An excess of white in the down may however be quite independent of the pied character, occurring in chicks which develop into normal blacks. Such “white” downs are recessive to normal black downs though the grade of pigmentation is probably complicated by a modifying factor, or factors.
The bearing of these facts is discussed in connection with certain difficulties sometimes met with in making use of the sex-linked cross barred ♀ × black ♂.
The experiments recorded in this paper have been carried out by means of the funds provided by the Development Commissioners for breeding research work with small animals.
Volume 19 Issue 3 May 1928 pp 337-350
The barring of the Gold Barred Rock, unlike that of the Chamois Carnpine, is due to a sex-linked barring factor. The Gold Barred Rock is essentially a buff with the addition of the barring factor. Evidence is adduced from a study of downs that the sex-linked barring factor probably exists in at least two allelomorphic states, differing in the intensity of their inhibitory action on the formation of pigment both in the down and in the adult plumage.
Volume 20 Issue 2 November 1928 pp 261-309
Volume 21 Issue 3 December 1929 pp 341-366
In conclusion we may add a few words on the impression which we have gathered from the available evidence as to the genetical nature of polydactyly in. the fowl. In the first place we feel little doubt that there is a definite factor for polydactyly. It is evident also that this factor can be carried by an apparently normal 4-toed bird. This is probably due to the existence of a factor (or possibly factors) inhibiting the action of the factor for polydactyly, and this factor (or factors) may be carried by normal recessive 4-toed birds. Further, since the evidence points to polydactylous birds being also capable of carrying the inhibitor, we must suppose that we are also concerned with some other factor, or factors, rendering possible the manifestation of the polydactylous effect in spite of the presence of the inhibitor. But although we have devised various schemes along these lines we have not found one which we consider satisfactory. Our failure, however, has been due more to lack of necessary data than to antagonistic facts. Where the gaps in the evidence are so large there are so many possible interpretations that we do not consider further efforts in this direction to be at present profitable. We agree with Dunn that “it is useless at present to frame more complex hypotheses since the data in a form wherewith to test them do not yet exist.” Yet through the tangle of facts we so often catch glimpses of apparent order that we feel confident that the solution, when it comes, will be found relatively simple.
Volume 22 Issue 3 July 1930 pp 395-397
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