ANSC 340 EXAM 3 (L14-18) QUESTIONS
AND ANSWERS (VERIFIED AND
UPDATED)
____: a measure of the strength of the relationship between performance (phenotypic values)
and breeding values for a trait in a population - ANS heritability
high heritability means that ____ have a large influence on _____ - ANS BV; Phenotypic value
Perfomance can predict ____ - ANS BV
BV can predict ____ - ANS performance
T/F: heredity is denoted as "h" but is often squared to "h^2" for calculations - ANS False,
heritability is denoted as "h^2"
T/F: h^2 = (the correlation between phenotype and BV)^2 - ANS True; heritability = r^2 of
p,BV
h^2 will range from.... - ANS 0 to 1
@2026/2027 ALLRIGHTS RESERVED.
,_____ the proportion of differences in performance for a trait that are attributable to
differences in breeding value for the trait - ANS heritability
____ in performance are whats heritable - ANS differences
heritability refers to a ____, not an ____ - ANS trait, individual
heritability of a trait ____ through populations, management schemes, and environments -
ANS varies
_____ h^2 is for reproductive traits - ANS low
lower h^2, ____ impact BV has - ANS lower
if we know nothing of genotypes, and we must select solely on phenotype, then.... -
ANS heritability becomes an issue
if the heritability of that trait is low, then breeding based on phenotype will _____ - ANS NOT
be efficient
can improve traits with ___h^2 through management - ANS low
_____: the strength of the relationship between repeated records for a trait in a population -
ANS repeatability
what are some examples of repeated traits? - ANS milk-related, litter size, show performance,
and fleece weight
when r is high, the first record of an animal ___ a good indicator of that animals next record -
ANS IS
@2026/2027 ALLRIGHTS RESERVED.
, when r is low, the first record ____ a good predictor of future records - ANS is NOT
____ is the strength of the relationship between single phenotypic values and producing
abilities for a trait - ANS repeatability
repeatability refers to a ____, not an ___ - ANS population, individual
T/F: repeatability is fixed - ANS FALSE; repeatability can vary from population to population
and environment to environment
T/F: repeatability = the regression pf PA on P - ANS True: r = b PA,P
repeatability is the correlations of ___ and ___ - ANS 1st phenotype to the 2nd phenotype;
and the phenotype to the producing ability
repeatability = variance of ___ over variance of ___ - ANS PA, P
r is almost always ____ h^2 - ANS at least as large as
use the ____ equation to predict PA based on records - ANS prediction
T/F: more records = better accuracy - ANS true
____ is a factor in BV - ANS heritability
heritability ______ fixed - ANS is not
@2026/2027 ALLRIGHTS RESERVED.
AND ANSWERS (VERIFIED AND
UPDATED)
____: a measure of the strength of the relationship between performance (phenotypic values)
and breeding values for a trait in a population - ANS heritability
high heritability means that ____ have a large influence on _____ - ANS BV; Phenotypic value
Perfomance can predict ____ - ANS BV
BV can predict ____ - ANS performance
T/F: heredity is denoted as "h" but is often squared to "h^2" for calculations - ANS False,
heritability is denoted as "h^2"
T/F: h^2 = (the correlation between phenotype and BV)^2 - ANS True; heritability = r^2 of
p,BV
h^2 will range from.... - ANS 0 to 1
@2026/2027 ALLRIGHTS RESERVED.
,_____ the proportion of differences in performance for a trait that are attributable to
differences in breeding value for the trait - ANS heritability
____ in performance are whats heritable - ANS differences
heritability refers to a ____, not an ____ - ANS trait, individual
heritability of a trait ____ through populations, management schemes, and environments -
ANS varies
_____ h^2 is for reproductive traits - ANS low
lower h^2, ____ impact BV has - ANS lower
if we know nothing of genotypes, and we must select solely on phenotype, then.... -
ANS heritability becomes an issue
if the heritability of that trait is low, then breeding based on phenotype will _____ - ANS NOT
be efficient
can improve traits with ___h^2 through management - ANS low
_____: the strength of the relationship between repeated records for a trait in a population -
ANS repeatability
what are some examples of repeated traits? - ANS milk-related, litter size, show performance,
and fleece weight
when r is high, the first record of an animal ___ a good indicator of that animals next record -
ANS IS
@2026/2027 ALLRIGHTS RESERVED.
, when r is low, the first record ____ a good predictor of future records - ANS is NOT
____ is the strength of the relationship between single phenotypic values and producing
abilities for a trait - ANS repeatability
repeatability refers to a ____, not an ___ - ANS population, individual
T/F: repeatability is fixed - ANS FALSE; repeatability can vary from population to population
and environment to environment
T/F: repeatability = the regression pf PA on P - ANS True: r = b PA,P
repeatability is the correlations of ___ and ___ - ANS 1st phenotype to the 2nd phenotype;
and the phenotype to the producing ability
repeatability = variance of ___ over variance of ___ - ANS PA, P
r is almost always ____ h^2 - ANS at least as large as
use the ____ equation to predict PA based on records - ANS prediction
T/F: more records = better accuracy - ANS true
____ is a factor in BV - ANS heritability
heritability ______ fixed - ANS is not
@2026/2027 ALLRIGHTS RESERVED.
