Lecture 15 - Selecting Flashcards
examples of indirect selection in the quality lab and the pulse lab
quality lab - NIR is not actually selecting for protein, but just associates calibration levels with protein
pulse lab - color sorter is looking for smoothed and wrinkled, not looking at how round they are
what kind of traits can be selected in early generations
seed coat colour
what kinds of traits need to wait for later generations
baking qualities because it is very expensive and takes a lot of time
what is pure line selection
working with starting material from an already existing population
steps of development of inbred lines
- create variability through crossing diverse parents
- self F1 to create large F2 population
- inbreed to homozygosity
ceiling effect
individual plants are selected and self-fertilized can only produce combinations of alleles that they already have
the usual F2 population is _________ plants
200-5000
what happens to the frequency of heterozygotes when you self in the development of inbred lines
goes down around 50% at each loci
what does selfing mean for the additive/dominance variation and accuracy of selection
additive and accuracy will increase, dominance will decrease
methods of inbreeding and selection
pedigree
bulk population
double haploidy
single seed descent
pedigree method
selection occurs in each gen, where seed from selected plants in one gen are used to grow family in the next (generates fake replication, as parent/progeny is recorded)
in pedigree method, higher heritable traits are selected for in _____ gen, while higher intensity is in ______ gen
earlier, later
