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- How is the response to selection related to narrow-sense heritability andthe selection differential? What information does the response toselection provide?What kind of heritability estimates (broad sense or narrow sense) are obtained from human twin studies?What is inbreeding depression? Why do self – pollinated crops do not show the ill- effects of inbreeding depression?
- The narrow-sense heritability of ear length in Reno rabbits is 0.4. Thephenotypic variance (VP) is 0.8, and the environmental variance (VE) is0.2. What is the additive genetic variance (VA) for ear length in theserabbits?The narrow-sense heritability for a trait is 0.4 and the selection differential is 0.5. What isthe predicted response to selection?A danger in computing heritability values from studiesinvolving genetically related individuals is the possibility that theseindividuals share more similar environments than do unrelatedindividuals. In the experiment shown in Figure 24.8, which dataare the most compelling evidence that ridge count is not causedby genetically related individuals sharing common environments?Explain
- If the heritability of a trait is 0.7 and the selection differential is -10, what is the predicted response to selection?The leaf width of a particular plant has an environmental variance of 2.3 cm, an epistatic variance of4.8 cm, a dominance variance of 1.6 cm, and an additive variance of 3.8 cm. Determine, and interpret,the broad sense and narrow sense heritability.TRAITS HERITABILITY Cutting Ability Racing Speed Jumping Ability Broad sense 0.53 0.55 0.55 Narrow sense 0.42 0.28 0.31 Which trait would have the best response for the selection for breeding purposes? Explain.
- Tail length in a population of peacocks has a phenotypic variance of 2.56cm^2 and an enviromental variance of 1.14cm^2. What is the broad sense heritability (H2)?Gray tree frog (Hyla versicolor) males call to females, and their calls can be characterized bythe pulse number and call period. The additive genetic variance of pulse number is 0.37,the additive genetic variance of call period is 0.16, and the covariance of the two traits is0.25. What is the additive genetic correlation of the two traits?The following variances were calculated for two traits in a herdof hogs.Trait VP VG VABack fat 30.6 12.2 8.44Body length 52.4 26.4 11.70 Calculate broad-sense (H2) and narrow-sense (h2) heritabilitiesfor each trait in this herd.