Matching Animal Breeding Exam 2

which of the following is not an assumption for Hardy Wineberg equilibrium?

unequal gene frequencies between sexes.

when controlling allele frequency through migration, which of the following is true?

it is necessary to catch and cull deleterious carriers before introducing them to the herd.

The probability of multiple independent events is the…

product of the probabilities of each event

which of the following is not a source of data used to calculate estimate breeding values?

Records on non-relatives.

To have a 95% confidence for a clean sire, n must equal five. What is N?

Number of observed offspring.

which of the following relatives will have the greatest value of performance records?

Parent

accuracy…

is the correlation between the estimated and true genotype

how many homozygous offspring does it take to determine if a parent is a recessive carrier?

1

as intensity increases, so does…

Response

Which of the following statements are true?

as the level of heritability increases, the accuracy of selection increases

which of the following selections have the greatest intensity?

10% selection

Both sires and dams may be progeny tested…

In litter-bearing species

When decreasing a herd size, the number of replacements (NR) _____, and intensity of selection ____.

Decreases ; Increases

Numeric

Quantitative Trait

Weight

Quantitative Trait

Uses many loci

Quantitative Trait

Red vs. Black

Qualitative Trait

Uses only one or few loci

Qualitative Trait

Fuzzy Observations

Threshold trait

Discrete Variables

Qualitative Trait

Random statistical fluctuations

Drift

Lower accuracy for progeny testing

Quantitative Trait

Trait susceptible to environmental effects

Drift

Problem of accurately classifying phenotypes

Threshold Trait

Trait not susceptible to environmental effects

Qualitative Trait

Bringing in new genetics from outside the population

Migration

Biochemical event of a change in DNA sequence

Mutation

Natural or artificial (crossbreeding) - (ps + qs) x (po +qo)

Migration

Source of all variation on an evolutionary scale

Mutation

Choosing animals with a high number of desired alleles

Selection

Somewhat limited effect on a historical/ contemporary scale

Mutation

Nature causing death or a lower production rate, causing less viable individuals

Selection

Rapid change in gene frequency by selling old herd and buying a new one

Migration

Discrete on the phenotypic scale and continuous on the genetic scale

Threshold Trait