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Glossary
Sections:
Introduction
Principles of inheritance
Genotypic variation
Other forms of heritable variation
Quantitative variation and heritability
Novel sources of genetic variation
The practice of plant breeding
Breeding methods
Breeding methods
Self pollinators: Mass selection
Self pollinators: Pure line selection
Self pollinators: Pedigree selection
The pedigree breeding funnel: wheat example
Self pollinators: Single seed descent and doubled haploid lines
Single seed descent
Single seed descent, contd
Doubled haploids
Self pollinators: Back-cross breeding
Self pollinators: male sterility and F1 hybrids
Manual emasculation
Chemical sterilization
Genetic male sterility
Cross pollinators: F1 hybrids
Cross pollinators: F1 hybrids, contd
Polyploids
Polyploids contd
Ploidy level affects fertility
Autopolyploid breeding
Alloployploid breeding
Vegetatively propagated crops
Tree crops
Participatory plant breeding
Plant Breeders' rights
New technologies for plant breeding
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Self pollinators: Mass selection

Phenotypic selection is carried out to identify the "best" types from a segregating population, a landrace etc. The progeny of these selections are bulked to produce the next generation.

The idea is to increase the mean performance of the population as a whole.

The expected result is a genotypically heterogeneous population which performs better than the original.

Can be repeated over successive generations (until the genotypic variation has been exhausted).

The efficiency of the approach is very dependent on the heritability of the trait under selection.