Question

Which of the following statements are true and why?

1. More accurate selection ca not improve the change of breeding values per generation.

2. Narrow-sense heritability is the accuracy of predicting breeding value from a single performance record on the individual.

3. If the narrow sense heritability is low, we need a large amount of progeny to allow the regression coefficient used to predict breeding value to approach 2 (the max) when the source of information is the average of single records on its progeny.

4. BLUP (best linear unbiased prediction) allows larger scale genetic evaluation for a population of organisms.

Answer 1

More accurate selection can improve the change of breeding values per generation.

Step-by-step explanation:

The correct statements are:

1. False. More accurate selection can improve the change of breeding values per generation. By selecting individuals with higher breeding values, we can increase the average genetic merit of the population over time.
2. True. Narrow-sense heritability is the accuracy of predicting breeding value from a single performance record on the individual. It measures the proportion of phenotypic variation in a trait that is due to additive genetic effects.
3. True. If the narrow sense heritability is low, we need a large amount of progeny to allow the regression coefficient used to predict breeding value to approach 1 (the maximum possible value) when the source of information is the average of single records on its progeny.
4. True. BLUP (best linear unbiased prediction) allows larger scale genetic evaluation for a population of organisms. It is a statistical method used to estimate breeding values and genetic merit based on information from multiple sources.