ANSC 4395 EXAM 4 QUESTIONS & ANSWERS WITH COMPLETE SOLUTIONS GRADED A+

ANSC 4395 EXAM 4 QUESTIONS &
ANSWERS WITH COMPLETE SOLUTIONS
GRADED A+

QUESTIONS AND ANSWERS
Quantitative traits. ANSWER -weights

-heights

-litter size

-number of eggs

-racing speed




controlled by many pairs of genes




Genetic effects. ANSWER -Additive effects

-Dominance effects

-Epistatic Effects




If a trait is controlled by many pairs of genes with additive gene action, it will be
easier to make improvement through selection. ANSWER •Because every added
desirable gene has a direct impact on the expected phenotype




Epistasis. ANSWER Interaction among genes at multiple loci

, Subdivision of environmental components. ANSWER -Temporary environment
effects




-Permanent environmental effects




If there is a normal distribution of phenotypes. ANSWER There is a normal
distribution of:




-Additive effects

-Dominance effects

-Epistatic effects

-Permanent environmental effects

-Temporary environmental effects




Heritability. ANSWER •The proportion of the phenotypic variation which is due to
additive gene effects




-The most important single concept in animal breeding




-In general it tells us how easy it is to make improvements through selection




-varies from herd to herd

-Varies with any herd if management changes