Heterosis for characters governed by two genes

Arunachalam, V. (1977) Heterosis for characters governed by two genes Journal of Genetics, 63 (1). pp. 15-24. ISSN 0022-1333

PDF - Publisher Version

Official URL: http://www.ias.ac.in/jarch/jgenet/63/15.pdf

Related URL: http://dx.doi.org/10.1007/BF02984221


An expression for heterosis over midparent is derived for characters governed by one gene when hybrids are made using arbitrarily inbred parents. It is shown that, so long as inbreeding does not depress the vigour and fitness of parents, heterosis in hybrids between them will be greater than that obtained in hybrids between open-pollinated parents. The expression derived tor heterosis for characters governed by two genes has brought to focus the possibilities of obtaining heterosis without the presence of dominance etfects, and also of dominance interactions. Arguments are advanced to illustrate that pure dominance hypothesis alone cannot account tor the observed heterosis when the character is under the control of more than one gene. It is found feasible that pure additive gene action at individual genic level coupled with a favourable additive x additive interaction can produce heterosis when gene frequency differences can be ensured. Implications of thisresult to problems in plant breeding are discussed.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:805
Deposited On:25 Sep 2010 04:40
Last Modified:16 May 2016 12:00

Repository Staff Only: item control page