ANSC 4395 Breeding and Genetics Exam 4 QUESTIONS
WITH COMPLETE ANSWERS
Results of selection are... Correct Answer: predictable in magnitude and direction
but prediction is only as good as the information
Response to Selection Correct Answer: is the genetic change that occurs as a result of selection
must take into consideration environment
Response is the function of what? Correct Answer: heritability and the selection differential
Selection Differential Correct Answer: is the difference between the mean performance of the
selected individuals and the average of the entire herd
Generation internal Correct Answer: the length of time it takes to replace members of 1
generation in a herd
symbol= L
the average age of the parents when any offspring is born
Breeding Value Correct Answer: An individual's phenotype is the result of its genetic merit and
the effect of the environment
Genetic merit is also called Correct Answer: Breeding Value
An individual receives half of its genetic make up from both parents Correct Answer: Expected
BV= 1/2 sire+ 1/2 dam
Estimated Breeding Value Correct Answer: - actual breeding value of an individual is never
known
- can be estimated from an individuals performance and the performance of its relatives
the clser relationship the better the estimates
-progeny, full sibs, half sibs, grand parents
When it comes to EBV.. Correct Answer: an additional information that can be obtained will
always increase EBV
Accuracy Correct Answer: is the confidence
-correlation between the true bv and the EBV
- will always be between 0-1 but never exactly 1 or 0
- the higher the better
The single most important piece of information in EBV is the... Correct Answer: Individuals
own performance
WITH COMPLETE ANSWERS
Results of selection are... Correct Answer: predictable in magnitude and direction
but prediction is only as good as the information
Response to Selection Correct Answer: is the genetic change that occurs as a result of selection
must take into consideration environment
Response is the function of what? Correct Answer: heritability and the selection differential
Selection Differential Correct Answer: is the difference between the mean performance of the
selected individuals and the average of the entire herd
Generation internal Correct Answer: the length of time it takes to replace members of 1
generation in a herd
symbol= L
the average age of the parents when any offspring is born
Breeding Value Correct Answer: An individual's phenotype is the result of its genetic merit and
the effect of the environment
Genetic merit is also called Correct Answer: Breeding Value
An individual receives half of its genetic make up from both parents Correct Answer: Expected
BV= 1/2 sire+ 1/2 dam
Estimated Breeding Value Correct Answer: - actual breeding value of an individual is never
known
- can be estimated from an individuals performance and the performance of its relatives
the clser relationship the better the estimates
-progeny, full sibs, half sibs, grand parents
When it comes to EBV.. Correct Answer: an additional information that can be obtained will
always increase EBV
Accuracy Correct Answer: is the confidence
-correlation between the true bv and the EBV
- will always be between 0-1 but never exactly 1 or 0
- the higher the better
The single most important piece of information in EBV is the... Correct Answer: Individuals
own performance
