BIOL 4150 Lecture 6: Lecture 6

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ochreherring44

17 Feb 2012

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R= response to selection on the trait (across generations, from parent to offspring. S = natural selection (within a generation do due an event/natural phenomena, ex: droughts, fires etc. ) H2= slope on graph plotting mean offspring phenotype vs. mean parent phenotype. Example: a researcher found average weight increases in darwin"s finches at 16. 06 g in parents and 17. 13 g in offspring. : could live elsewhere but can"t get there. Could live elsewhere but chooses not to: dispersal, habitat selection, competition, predation, disease, physiology. : tolerance thresholds too hot, too dry, too abiotically unpredictable.

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This is for my evolution class and these are the formula i might have to use: S=t* - t bar and R= h^2 S

You are running a kangaroo farm, and are very tired to building high fences to keep the âroos in. you decide to artificially select for kangaroos that have poor jumping ability. Your kangaroo herd can currently jump an average of three meters high. You would prefer to have a herd that jumps on average only 2 meters high. Your strategy is to select a group of poor jumpers, with an average jumping height to two meters, as the only individuals allowed to reproduce and create the next generation. Will this create a population in the next generation with an average jumping height of 2 meters? Why or why not? What additional information would you need to have to figure this out?

After reviewing your BBio466 notes more carefully, you decide to conduct some breeding experiments so you can compare jumping heights in parents and offspring.

Below is a table showing the jumping heights (m) of parents (columns 2 and 3) and their offspring (columns 2 and 5)

Breeding pair	Parent 1	Parent 2	Offspring 1	Offspring 2
1	4	3	3	2
2	2	3	1	3
3	3	5	3	2
4	1	2	0.5	3
5	1	1	1	2

What would you graph to estimate heritability? What value on this graph tells you heritability? Give an approximate value for heritability.

Predict the mean jumping height of the kangaroos in the next generation (i.e. the offspring the kangaroos you allowed to breed). Show your calculations.

A population of birds has an average tarsus (part of the leg) length of 20 mm. The successful breeders in this population have an average tarsus length of 25 mm.

What is the selection differential?

If the narrow sense heritability tarsus length was 1.0, what would the average tarsus length of the offspring be?

If the narrow sense heritability of tarsus length was .5, what would the average tarsus length of the offspring be?

erinsheep375

Which of the following is NOT required for there to be evolution through natural selection:A. The population must be mating randomlyB. the trait must be heritableC. One genotype must reproduce successfully more than another genotypeD. The needs to be phenotypic variationE. all are required for natural selection

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BIOL 4150 Lecture 6: Lecture 6

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