H. W. Howard
Articles written in Journal of Genetics
Volume 35 Issue 3 February 1938 pp 383-386
The chromosome number of three varieties of swede was found to be
Volume 36 Issue 2 July 1938 pp 239-273
Volume 38 Issue 1-2 July 1939 pp 325-340
Volume 40 Issue 1-2 May 1940 pp 83-108
Volume 43 Issue 1-2 January 1942 pp 105-119
2. The amphidiploid (2
3. A study was made of crosses between
4. A high set of good seeds per fruit is produced in crosses of the types, diploid × diploid, tetraploid × tetraploid and tetraploid female × diploid. Crosses of the type diploid female × tetraploid never produced a high set of good seeds, developed ovules only being obtained from such crosses.
6. Good seeds from crosses of the type tetraploid female × diploid are only about one-third the size of normal seeds from selfing diploids. ‘Hybridity’ may also produce a reduction in seed size.
7. It is suggested that some allotetraploid species may have evolved so as to have a ‘diploid physiology’.
Volume 44 Issue 1 September 1942 pp 1-9
2. The origin of new meristems from vacuolated cells in calluses is described.
3. Theories to account for the occurrence of tetraploid callus shoots are considered. It is suggested that the tetraploid areas in calluses are caused by the division of vacuolated cells which contain nuclei with diplochromosomes.
Volume 44 Issue 2-3 December 1942 pp 143-159
Volume 46 Issue 2-3 January 1945 pp 358-360
The potato varieties King Edward and Gladstone are simplex for the gene
The variety Flourball is nulliplex for
Volume 48 Issue 1 April 1947 pp 111-118
Volume 49 Issue 3 December 1949 pp 235-240
Volume 50 Issue 3 February 1952 pp 511-521
Volume 51 Issue 2 January 1953 pp 259-269
The common colour m the woodlouse,
Bed animals occur at a frequency of from 5 to 8 % in many populations.
Reel body colour may be due to animals being homozygous or heterozygous for a dominant gene R, or to animals being homozygous for a recessive gene r.
Animals homozygous for the recessive gene r and homozygous or heterozygous for the dominant gene R cannot be distinguished.
R and r are allelomorphic, the series being R (dominant red), + (black), r (recessivered).
The black and red pigments are melanins.
It is suggested that in
Volume 56 Issue 1 July 1958 pp 1-10
1. Sex ratios of broods were studied in two lines of the woodlouse,
2. One line was found to breed true for amphogeny (1:1 sex ratios), and the other line bred almost true for thelygeny (nearly 100% females).
3. In the amphogenic line there was a small excess of females over males. Similar excesses of females are found in broods from amphogenic females of other woodlouse species.
4. Sex determination in woodlice, the origin of monogenic broods, and the inheritance of monogeny are discussed.
Volume 56 Issue 3 December 1959 pp 325-340
1. Methods for recognising S allele homozygotes in inbred families from parents heterozygous for alleles which may have four possible dominance relations are discussed.
2. Examples are given of the recognition in inbred families of homozygotes for two S alleles present in the parents when one allele is dominant in both pollen and style, when one allele is dominant in the pollen only, when one allele is dominant in the style only, and finally when both alleles are active in both pollen and style.
3. Self-compatible plants in the inbred offspring of self-incompatible plants may be either homozygous for a self-fertility allele in the S series or for a recessive allele independent of the S allele series. Female sterility may also be due to genes linked with the S alleles or independent of them.
4. Pseudo-compatibility occurred in many families, but it was possible to ignore it in the analysis of the pollination results for the recognition of S allele homozygotes.
Volume 58 Issue 1 April 1962 pp 29-38
1. The woodlouse,
2. The rarer types of body colour may be due to either dominant or recessive factors. Some types are sex-limited to females.
3. Populations near Cambridge were scored for different colour types. About 12 per cent of the females were of the rarer types.
4. There was evidence in the case of the dominant factor for red body colour that heterozygotes were more viable than homozygotes.
5. Woodlice are eaten by birds, and this could be a cause maintaining the polymorphic structure of populations.
Volume 58 Issue 2 March 1963 pp 177-185
1. The wild Mexican potato,
2. Top-grafted with scions of
3. The tubers from plants grafted in the previous year produce plants which emerge and flower earlier than those from plants not grafted.
4. Grafting for two years may produce a larger yield of tubers than grafting for one year only.
5. For both time of emergence and time of flowering, grafting in the previous year was just as effective in most experiments as grafting for two or more years previously. Also a single year without grafting led to the disappearance of any effects from grafting.
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