Question

A fish breeder notes that wild sardines have a mean body length of 18 cm (six-week-old fingerlings). He has a stock of domesticated sardines that are especially tasty, but they have a mean length of only 10 cm at 16 weeks. He wishes to increase the rate of growth in his stock by selecting for increased length at six weeks after hatching. He selects large adult fish from his domesticated stock, and this pool of breeders at 16 weeks has a mean length of 15 cm. He breeds this group to produce a new generation of fingerlings, and these progeny have a mean length of 12.5 cm at 16 weeks. The adults in his stock that were not allowed to breed had a mean length of 7.2 cm. Estimate the narrow-sense heritability of fingerling length at six weeks of age given these data. A) 0 B) 0.31 C) 0.50 D) 0.62 E) 0.68 F) 1.00

          A fish breeder notes that wild sardines have a mean body length of 18 cm (six-week-old fingerlings). He has a stock of domesticated sardines that are especially tasty, but they have a mean length of only 10 cm at 16 weeks. He wishes to increase the rate of growth in his stock by selecting for increased length at six weeks after hatching. He selects large adult fish from his domesticated stock, and this pool of breeders at 16 weeks has a mean length of 15 cm. He breeds this group to produce a new generation of fingerlings, and these progeny have a mean length of 12.5 cm at 16 weeks. The adults in his stock that were not allowed to breed had a mean length of 7.2 cm. Estimate the narrow-sense heritability of fingerling length at six weeks of age given these data.

A) 0
B) 0.31
C) 0.50
D) 0.62
E) 0.68
F) 1.00

Added by Daniel -.

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