1.10 A classic example of natural selection is the change in relative populations of thepeppered moth that occurred during the industrial revolution in England. After theindustrial revolution in 1870s, booming industrial cities started releasing tons of blacksoot, blackening tree trunks and rocks and creating an environment where moths withlight colours were easily predated by birds. Peppered moths captured in 1850 and 1900reveal that two industrial cities (X and Y) had the following percent distributions.Year 1850 1900Moths Light coloured Dark coloured Light coloured Dark colouredX 66 34 22 78Y 65 35 27 73Pollution control rules were introduced in 1902 and were properly followed in city Y, butnot in city X. If all other factors remain constant, then what could be the approximateexpected distribution of light and dark coloured moths in 1950?(A) Light X = 8, Y = 28 and Dark X = 92, Y = 72(B) Light X = 8, Y = 62 and Dark X = 92, Y = 38(C) Light X = 18, Y = 23 and Dark X = 82, Y = 77(D) Light X = 18, Y = 50 and Dark X = 82, Y = 50

Naveen Kumar , 9 Years ago

Grade 12