What is pure line selection?
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 theory?
Pure Line Theory. A pure line is the progeny of a single self fertilized homozygous plant. The concept of pureline was proposed by Johannsen on the basis of his studies with beans (Phaseolus vulgaris) variety called Princess.
What are the main features of pure line?
The main features of pure-lines are briefly presented below:
- Homogeneous:
- Non-Heritable Variation:
- Highly Uniform:
- Selection is Ineffective:
- Narrow Adaptation:
- More Prone to New Diseases:
- Isolation of Pure-Lines:
- Sources of Variation:
Who developed pure line selection?
W. L. Johannsen
Is pure line homozygous?
Pure line is true breeding genotypes, line that has been rendered homozygous for all genes under consideration in successive generations, a line in which homozygous individuals produce only homozygous offspring like parents. Thus, pure line breed refers to homozygosity only.
How do you make a pure line?
Pure lines are obtained through repeated self-fertilization of heterozygous individuals or consanguineous crosses in heterozygous populations. Under Mendelian inheritance, the offspring of a single self-fertilization will be heterozygous for one-half as many genes as the parent.
What are the merits of pure line selection?
Merits of Pureline Selection: The pureline varieties are extremely uniform since all the plants in the variety have the same genotype. These uniform varieties are more liked by farmers and consumers. ii. Pureline selection achieves the maximum possible improvement over the original variety.
What are the merits and demerits of pure line selection?
Advantages & Disadvantages of Pureline Selection. Rapid method, lines are usually genetically fixed and yield trials can be immediately conducted. Plants in such variety react in similar fashion to environmental conditions, means they are uniform in performance and at the same time in appearance too.