You are studying directional selection on neck length in two giraffe populations
ID: 199856 • Letter: Y
Question
You are studying directional selection on neck length in two giraffe populations. Below you can see data on neck length of the whole population and breeding parents for each population.
Population 1:
Individual
Neck length
Breeder
1
50
No
2
80
Yes
3
90
Yes
4
45
No
5
60
Yes
6
35
No
7
95
Yes
8
40
No
9
75
Yes
Population 2:
Individual
Neck length
Breeder
1
55
No
2
75
Yes
3
45
No
4
60
Yes
5
40
No
6
90
Yes
7
45
No
8
70
Yes
9
80
Yes
(a) Calculate the selection differential for each population. Show your work.
You also have some data on the length of necks for parents and their offspring (offspring corresponding to each mid-parent listed in adjacent cell).
Population 1:
Mid-parent
Mid-offspring
85
84
90
88
75
75
65
62
70
69
80
82
95
94
Population 2:
Mid-parent
Mid-offspring
80
65
75
90
85
55
65
75
70
85
95
75
60
80
(b) Describe how you would use this data to calculate narrow sense heritability.
(c) Based on parts ‘a’ and ‘b,’ in which population would you expect to see the largest evolutionary change in neck length in the next generation? Explain your answer.
Individual
Neck length
Breeder
1
50
No
2
80
Yes
3
90
Yes
4
45
No
5
60
Yes
6
35
No
7
95
Yes
8
40
No
9
75
Yes
Explanation / Answer
A}. Selection differential(S )= mean of selected parent - mean of original population
Population 1 => s=0 ........s= 560/7- 400/5= 80-80=0
Population 2 => s= 0 ........s=525/7- 375/5=75-75=0
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