1 / 4

Evolutionary theory predicts the direction and magnitude of evolutionary change

Evolutionary theory predicts the direction and magnitude of evolutionary change. Change in trait mean (phenotype) of a population from one generation to the next Change in allele frequency (genotype) from one generation to the next. What will beak size be in the next generation?.

fineen
Download Presentation

Evolutionary theory predicts the direction and magnitude of evolutionary change

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Evolutionary theory predicts the direction and magnitude of evolutionary change Change in trait mean (phenotype) of a population from one generation to the next Change in allele frequency (genotype) from one generation to the next

  2. What will beak size be in the next generation? Selection differential = S = 10.1mm – 9.4mm = 0.7mm Response to selection = R = 9.7mm – 9.4mm = 0.3mm

  3. The “breeder’s equation” h2 = 0.77 R = S x h2 Predicted R = 0.7mm x 0.77 = 0.5mm Observed R = 0.3mm Estimated heritability from parent/offspring regression = 0.77 Realized heritability = R/S = 0.43 How might these discrepancies be explained, and how might the explanation(s) be tested experimentally?

  4. Heritabilityfrom Falconer and Mackay, Quantitative Genetics Back-fat Body weight Body weight Food conversion Bristle number Tail length Butterfat % Egg weight Body size Ovary size Weight gain Body weight Milk yield Litter size Egg number Egg number Litter size Pigs Mice Cattle Chickens Drosophila What does this tell us?

More Related