What Is Mass Selection?

What is the purpose of mass selection?

Mass selection The seed from selected plants is bulked for the next generation.

This method is used to improve the overall population by positive or negative mass selection.

Mass selection is only applied to a limited degree in self-fertilizing plants and is an effective method for the improvement of land races..

Who discovered mass selection?

Glenn W. Burton. Mass selection is man’s oldest plant breeding method. It was used 10,000 years ago to gradually change weedy grasses into the cereals—grain crops that today supply three-fourths of man’s energy and over half of his protein.

What is positive mass selection?

Positive mass selection means when we select the desirable crops from a mixed population, then we mix their seeds together to raise next generation. In this method the base material can be land races or old varieties.

How old is a pure line selection?

The concept of pure-line selection was developed in the middle of 19th century in Sweden. However, the genetic basis of pure lines was explained by Johannsen, a Danish biologist in 1903. Pure-line refers to the homogenous progeny of a self pollinated homozygous plant.

What is pure line selection?

Pure-line selection involves selecting and breeding progeny from superior organisms for a number of generations until a pure line of organisms with only the desired characteristics has been established.

What is pure line?

The definition of a pure line is a result of inbreeding where animals or plants have certain characteristics that are the same through generations. An example of a pure line is the result of inbreeding of a certain flower to help it fight off diseases. noun.

What is individual selection?

Individual selection refers to pressures that lead to individual adaptations and more selfish traits.

In which crops the method of mass selection is mainly applied?

The mass selection is practiced in the cross-pollinated crops and the self-pollinated crops which are selected for the phenotype appearance, which is done for the observable characteristic of the plant such as the height of the plant, grain size, etc. Hence, the correct option is ‘C’.

What is mass selection and pure line selection?

The main difference between mass selection and pure line selection is that a mass selection contains a mixture of pure lines, whereas a pure line selection contains a set of uniform characteristics. … Mass selection and pure line selection are two types of selective breeding methods used to improve crops.

What is individual or mass selection?

Individual or mass selection is the simplest, oldest and most often effective method of selection, where the best individuals are selected from a population on the basis of their own ‘phenotypic value’ compared to the population means, e.g., the largest individuals, the survivors of a disease, or according to their …

What is progeny selection?

definition. In selection. Progeny selection indicates choice of breeding stock on the basis of the performance or testing of their offspring or descendants. Family selection refers to mating of organisms from the same ancestral stock that are not directly related to each other.

How the new variety can be developed through mass selection?

Mass Selection: When a large number of plants of similar phenotype are selected and their seeds are mixed together to constitute a new variety is called mass selection. The population obtained from the selected plants would be more uniform than the original population.

Is oldest method of plant selection?

Selection is the oldest crop improvement method compared to hybridization, mutation and introduction. Thus, option B is correct.

What is the pedigree method?

Pedigree refers to record of the ancestry of an individual selected plant. Pedigree breeding is a method of genetic improvement of self-pollinated species in which superior genotypes are selected from segregating generations and proper records of the ancestry of selected plants are maintained in each generation.

Which is the oldest breeding method?

Selection also called the German method is the oldest plant breeding method.It is the preservation of plants of desirable characters and then growing them. Thus the correct answer is option B.