Joe wants to improve the genetic merit of trait 1 in his population. He performed phenotypic selection on trait 1 (direct selection) and trait 2 (indirect selection), respectively, and wants to know which method is better. We know that the correlation between BV of trait 1 and trait 1 is 0.3, the correlation between BV of trait 2 and trait 2 is 0.15, the genetic correlation between trait 1 and trait 2 is 0.7, the BV variance of trait 1 is 4, and the selection intensity in both methods is 1.
1. Calculate the response to direct selection.
2. Calculate the response to indirect selection.
3. Which selection method is more efficient (has a greater response to selection)?