The graph depicts data from oat varieties and resistance genes of grain pathogens in the years 1942-1954.
Using the graph, which of the following statements
explain how natural selection affected the genetic
variation of the populations of fungi?
100
90
80
70
50
of lowa Oat Acreage or
Rust Population
40
30
20
10
Natural selection affected the biotic environment of
the oat grains by selecting for a more virulent gene in
each generation,
O Natural selection affected the abiotic environments of
the fungi by selecting against a more virulent gene in
each generation,
Natural selection affected the direction of evolution by
selecting for virulence in different types of oat grains in
different generations
Natural selection affected the rate of evolution by
selecting against virulence in the same types of oat
grains in different generations,
1942
1945
1948
Year
1951
1954
Victoria R-genes
Vidona fungus
Bond R genes
- Bond fungus