This is for my evolution class and these are the formula i m

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 ‘roos 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.

Solution

The gene responsible for determining the jumping height of kangaroos is controlled by a pair of alleles, one dominant and one recessive. Let us assume that the allele for low jumping gene is dominant and the high jumping gene is recessive. If the population of kangaroos, whose average jumping height is not more than 2 meters, are bred, then we will not get all the low jumping kangaroos in just 1 generation. It will take many generations to establish a population where only low jumping kangaroos are present.

The kangaroos which jump low may be having a heterozygous condition for the gene of jumping height. Breeding of such population will lead to the presence of high jumping ones as well.

Hence, more information is needed, such as the phenotype and genotype of the individual kangaroos in order to determine the number of generations required.