In one population of tomato plants, the mean fruit weight is 60g and the h^2 = 0

Question

In one population of tomato plants, the mean fruit weight is 60g and the h^2 = 0.3. In a seconds population of tomato plants, the mean fruit weight is also 60g but h^2 = 0.5.
Predict the mean fruit weight among the progeny of tomato plants whose fruit weight averages 80g in each population separately. Why does the prediction differ between the two populations? In one population of tomato plants, the mean fruit weight is 60g and the h^2 = 0.3. In a seconds population of tomato plants, the mean fruit weight is also 60g but h^2 = 0.5.
Predict the mean fruit weight among the progeny of tomato plants whose fruit weight averages 80g in each population separately. Why does the prediction differ between the two populations? In one population of tomato plants, the mean fruit weight is 60g and the h^2 = 0.3. In a seconds population of tomato plants, the mean fruit weight is also 60g but h^2 = 0.5.
Predict the mean fruit weight among the progeny of tomato plants whose fruit weight averages 80g in each population separately. Why does the prediction differ between the two populations?

Explanation / Answer

Heritability is given as:

h2 = R/S ----> (1)

Where h2 = heritability

R= Selection Response

S= Selection Differential

Let the mean weight be X. Now putting values in (1) we get,

0.3 = 80- X/60

18 = 80-X

X = 80-18 = 62g

For second population substituting the given values in (1) we get,

0.5 = 80 - X/ 60

30 = 80 - X

X = 50g

Thus, the mean fruit weight among progeny of tomato plants are 62g and 50g respectively for first and second population respectively.

The difference is due to the variance for heritability for trait in each population.

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