Evolution of the genetic systems in higher plants
Author
Source
Sudan Journal of Basic Sciences. |n Series : Biological Sciences
Issue
Vol. 1, Issue 1 (31 Jan. 2001), pp.11-26, 16 p.
Publisher
Sudan Institute for Natural Sciences Publication Unit
Publication Date
2001-01-31
Country of Publication
Sudan
No. of Pages
16
Main Subjects
Topics
Abstract EN
The internal factors which influence the frequency of genetic recombination in a species are called the genetic system.
It includes the chromosomal machinery and the mode of reproduction, and has an evolutionary course of its own.
This is expressed in variation in the nature of the balance between, fitness and flexibility.
This variation is described in this paper, with particular reference to the genus Carthamus L.
The presence in Carthamus of two basic chromosome numbers (x=10 and x=12), four groups of species with n=l 0,12,22 and 32 chromosomes and different levels of compatibility makes it an ideal genus for the study of genetic systems.
Increase in chromosome number was accompanied with increase in recombination index and self-compatibility, and self-incompatibility was associated with lower chiasma frequency.
There was lower recombination index in cross-fertilized species than in self-fertilized ones.
It is concluded that factors which promote flexibility are associated with factors which restrict it.
American Psychological Association (APA)
Khidir, M. O.. 2001. Evolution of the genetic systems in higher plants. Sudan Journal of Basic Sciences. |n Series : Biological Sciences،Vol. 1, no. 1, pp.11-26.
https://search.emarefa.net/detail/BIM-271125
Modern Language Association (MLA)
Khidir, M. O.. Evolution of the genetic systems in higher plants. Sudan Journal of Basic Sciences. |n Series : Biological Sciences Vol. 1, no. 1 (Jan. 2001), pp.11-26.
https://search.emarefa.net/detail/BIM-271125
American Medical Association (AMA)
Khidir, M. O.. Evolution of the genetic systems in higher plants. Sudan Journal of Basic Sciences. |n Series : Biological Sciences. 2001. Vol. 1, no. 1, pp.11-26.
https://search.emarefa.net/detail/BIM-271125
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 24-26
Record ID
BIM-271125