Question

* A strawberry farmer determines that the average weight of individual strawberries produced by plants in his garden is 2 g. He selects the 10 plants that produce the largest strawberries; the average weight of strawberries produced by these selected plants is 6 g. He interbreeds these selected plants. The progeny of these selected plants produce strawberries that weigh an average of 5 g. If the farmer were to select plants that produce strawberries with an average weight of 4 g, what would be the predicted weight of strawberries produced by the progeny of those selected plants

Answer 1

R = Alteration among mean initial population and mean offspring of designated parents

`R=5g - 2g = 3g`

S = Assortment alteration among the mean initial population and the mean designated parents

`S = 6g - 2g = 4g`

`R= h^(2) * 5`

`3g =h^(2) (4g) =0.75`

if the designated selected plants averaged
`4g` then S would be
`2g` and

`R = 0.75(2g) = 1.5 g`.

Thus, the average weight of strawberries would be
`2g + 1.5g = 3.5 grams`