Question

write notes on evolution of crop plants of varieties?​

Answer 1

Answer:

the models of plants have developed in nature from the primitive forms as a result of evolution. the genetic evolution of some important field crops such as wheat cotton, tobacco, potato, maize and rice.

Answer 2

Meaning of Evolution:

A divergent process which increases genetic diversity and leads to change in allelic frequencies in a population is known as evolution. In other words, a process which leads to significant deviation in the characteristic features of existing individuals as compared to their pre-existing individuals is termed evolution. Thus, evolution leads to change in genetic composition of a population or individuals of population.

The evolution is of two types, viz:

The evolution is of two types, viz:(1) Natural evolution, and

2) Man-made evolution.

✒In case of natural evolution, natural selection operates, while in man-made evolution human selection operates. Thus, both natural and human selections play significant role in the process of evolution. Plant breeding is considered as current phase of crop evolution.

↪Changes which are brought out as a result of evolution are measured in terms of morphological, anatomical, embryological, physiological, biochemical and genetic modifications in the present forms of individuals as compared with their past forms.

Changes which are brought out as a result of evolution are measured in terms of morphological, anatomical, embryological, physiological, biochemical and genetic modifications in the present forms of individuals as compared with their past forms.Genetic Basis of Evolution:

▶Selection plays a key role in the process of evolution. Selection either by nature or by human has been responsible for evolution of various crop plants. However, selection is effective in changing the features of species only when vast variability exists in the population of that species.

Hope it helps u dear...❤❤❤