Ch 24

Question 1

Discontinuous

Answer 1

only a few phenotypes

tall OR short

Question 2

Discontinuous

Answer 2

only a few phenotypes

tall OR short

Question 3

Continuous

Answer 3

numerous phenotype

tall, short, and everything inbetween

Question 4

Threshold Traits

Answer 4

appears discontinuous but has strong influence of environment
i.e. susceptibility to diseases

Question 5

meristic trait

Answer 5

one that is measured in whole numbers

i.e. litter size

Question 6

Additive Gene Interaction

Answer 6

no influence of the environment on development of the trait

Question 7

Environmental Variation Can Convert a ___ into a ___

Answer 7

Discrete Trait into a Continuous Trait

Question 8

Heritability

Answer 8

the proportion of phenotypic variance due to genetic variance
H2 = Vp/Vg

Question 9

Broad sense heritability

Answer 9

the proportion of a population’s phenotypic variance due to variation in genotype.
isn’t useful for predicting how much offspring will resemble parents

Question 10

narrow-sense heritability (h2)

Answer 10

relationship between trait values in parents and their offspring.

Question 11

If h2 is less than 1.0, then the slope of a regression line for mean offspring value versus mean parent value will be _ 1

Question 12

The slope of a regression line estimates

Answer 12

h2

Question 13

Narrow Sense Heritability

Answer 13

h2 = Va/Vp

Question 14

response to selection

Answer 14

R = h2 x S, where S = the selection differential (difference between the mean of the population and the mean of the selected parents)

Question 15

For selection to occur, there must be:

Answer 15

Variation in a trait that is due at least partially to variation in genes
Genetic variation in the population under selection

Question 16

Selection limits are due to one or a combination of

Answer 16

Loss of additive genetic variance in response to selection

Fitness decrease due to a genetic correlated response

Question 17

Continuous

Answer 17

numerous phenotype

tall, short, and everything inbetween

Question 18

Threshold Traits

Answer 18

appears discontinuous but has strong influence of environment
i.e. susceptibility to diseases

Question 19

meristic trait

Answer 19

one that is measured in whole numbers

i.e. litter size

Question 20

Additive Gene Interaction

Answer 20

no influence of the environment on development of the trait

Question 21

Environmental Variation Can Convert a ___ into a ___

Answer 21

Discrete Trait into a Continuous Trait

Question 22

Heritability

Answer 22

the proportion of phenotypic variance due to genetic variance
H2 = Vp/Vg

Question 23

Broad sense heritability

Answer 23

the proportion of a population’s phenotypic variance due to variation in genotype.
isn’t useful for predicting how much offspring will resemble parents

Question 24

narrow-sense heritability (h2)

Answer 24

relationship between trait values in parents and their offspring.

Question 25

If h2 is less than 1.0, then the slope of a regression line for mean offspring value versus mean parent value will be _ 1

Answer 25

less than

Question 26

The slope of a regression line estimates

Answer 26

h2

Question 27

Narrow Sense Heritability

Answer 27

h2 = Va/Vp

Question 28

response to selection

Answer 28

R = h2 x S, where S = the selection differential (difference between the mean of the population and the mean of the selected parents)

Question 29

For selection to occur, there must be:

Answer 29

Variation in a trait that is due at least partially to variation in genes Genetic variation in the population under selection

Question 30

Selection limits are due to one or a combination of

Answer 30

Loss of additive genetic variance in response to selection Fitness decrease due to a genetic correlated response