Solved problems 675 genetic correlation (p. 657) genetic variance (p. 656) heritability in the narrow sense ( h 2 ) (p. 661) heritable (p. 654) hybrid–inbred method (p. 664) inbreeding (p. 650) least-squares regression line (p. 672) marker gene (p. 664) mean (p. 648, 668) relative frequency (p. 668) sample (p. 672) segregating line (p. 652) selection differential (p. 662) selection response (p. 662) standard deviation (p. 669) statistical distribution (p. 647) truncation selection (p. 663) universe (p. 672) variance (p. 648, also 669) midparent value (p. 661) mode (p. 648) multiple-factor hypothesis (p. 650) norm of reaction (p. 651) phenotypic correlation (p. 658) quantitative genetics (p. 647) quantitative trait locus (QTL) (p. 665) regression line of y on x (p. 672) relation (p. 648) SOLVED PROBLEMS 1. In some species of songbirds, populations living in different geographical regions sing different “local di-alects” of the species song. Some people believe that this difference in dialect is the result of genetic differences between populations, whereas others believe that these differences arose from purely indi-vidual idiosyncracies in the founders of these popula-
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