Chromosoma Focus

Comparative genome analysis enables the sites of centromeres, telomeres and nucleolar organiser regions to be aligned with borders that define the sets of linked genes conserved across the cereal genomes. This provides a basis for studying cereal genome evolution.     

Chromosoma prize 1993

Chromosoma prize 1993     

Chromosoma Prize 1994

Chromosoma Prize 1994     

Chromosoma prize 1989

Chromosoma prize 1989     

Chromosoma Prize 1991

Chromosoma Prize 1991     

Focus

A solid background in population ecology is valuable for anyone concerned with natural resources management. However, without the opportunity of field experience, it may be difficult for students to become familiar with some of the principles of population biology. Microcomputers and programmable pocket calculators allow the construction of simple simulation models, making it possible to carry out some ‘numerical experiments’ in the classroom which may play the same role in the learning process as in vivo experimentation

This work introduces a mathematical model based on the Lotka—Volterra equations and a computer program developed for a programmable calculator. They can be used to assess the influence of environmental heterogeneity and disturbances on the results of competitive relationships between two plant populations. As an example, the interaction between two tussock grass species of the Patagonian steppe, Stipa speciosa Trin. et Rupr. and Festuca pallescens (St Yves) Parodi (the second being less xerophytic than the first one), is analysed.