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Help with genetics/evolution questions please?
In a population of dogs, the mean head width is 10 cm. You decide that only
dogs on the upper end of the population with a mean head size of 15 cm are
allowed to breed.
What is the selection differential?
Next, you allow only those dogs from the upper end of the distribution with a
mean of 15 cm to breed and their babies, when they grow up show a mean head
size of 12 cm.
What is the response to selection?
Give this, what is the narrow sense heritability of the trait?
THIS IS NOT HOMEWORK - THIS IS A REVIEW!!
Please help me better understand this - it's for an exam. Thank you so much - I appreciate your time!
1 Answer
- yutgoyunLv 68 years agoFavorite Answer
All of this is easily solved by plugging and playing into the (base) breeders equation:
R = (h^2)S
R is the actual response.
S is the selection differential.
h^2 = narrow sense heritability
S = 15-10 = 5
R = 12-10 = 2
Use some algebra to solve h^2 = 2/5 = 0.4
If you want a better understanding, the key term here is heritability. Narrow sense heritability, in plain talk, is a number that tells use how much of what you see will be passed on to the next generation.
Source(s): I'm a plant breeder
