Lecture 16 - Selecting

Question 1

why do we self inbreeding crops

Answer 1

to make more homozygosity to reduce dominance and increase additive effect

Question 2

what is the main advantage to pedigree selection

Answer 2

can trace lines back to parents and generate fake replication

Question 3

bulk method is kind of ________ to the pedigree method

Answer 3

opposite

Question 4

purpose of the bulk method

Answer 4

inbreed populations to homozygosity as quickly as possible before selection starts

Question 5

bulk method

Answer 5

natural selection is the only force in the early segregating generations and selection from the breeder doesn’t start until a high homozygosity is reached

Question 6

why does bulk method allow for the use of winter nurseries

Answer 6

you are not selecting yet so you dont have to worry about different environments

Question 7

what generation does selection for the breeder typically start in the bulk method

Answer 7

F5 on moderate to highly heritable traits

Question 8

genotypic frequencies in a population handled by bulk method are determined by

Answer 8

• genetic potential for seed productivity
• competitive ability of genotypes
• influence of the environment on genotypic expression
• sampling error

Question 9

what gene action is selected on in bulk method

Answer 9

additive gene action