How does Figure 4 in the Storz (2007) paper communicate the role that natural se

Question

How does Figure 4 in the Storz (2007) paper communicate the role that natural selection has played in deer mice populations?

28 JOURNAL OF MA 38 a rubidus O gambeli 37 A bard v austerus luteus 36 ? rufinus 34 32 30 0 500 1000 500 2000 2500 3000 3500 Altitude (m) Fic. 4-Variation in blood oxygen affinity (as measured by half- saturation of hemoglobin [Psol) among subspecies of Peromyscus maniculatus from different altitudes across western North America. Based on data compiled by Snyder ct al. (1988).

Explanation / Answer

From the graph, we can say that the oxygen affnity of animals living in lower altitude is lesser than the oxygen affinity of animals living in higher altitude. Reduced oxygen affinity in higher altitude ensures better oxygen delivery to the tissue. This characteristcs is a result of the phenomenon in which the individuals with the adavantagous trait is chosen according to the environmental condition. Thus this graph shows natural selection.

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