Answer: 539g
Explanation:
First calculate for total variance Vt = Vg + Ve
Vt = 870 + 1340 = 2210
Next, calculate narrow sense heritability h = Va/Vt
h = 870/2210 = 0.39
h = (next generation - original)/(selected - original)
0.39 = (next generation - 500)/(600-500)
Next generation mean weight = (0.39 × 100) + 500 = 539