vault backup: 2026-11-13 14:33:23

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biology/G11 Pre-AP Biology/Unit 3 TBD/Patterns of Selection.md

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+[[Unit 3 (TBD)]]
+Natural selection is situational. It requires heritable variation, competition, and selective pressures.
+==Selective pressure== are environmental conditions pressuring traits.
+==Selective advantage== is a genetic advantage.
+
+Sexual selection is mate selection for a particular phenotype. It may affect fitness.
+Females choose their mates.
+Good genes hypothesis: Females choose mates on traits that improve chance of survival.
+Runaway hypothesis: Females choose on basis of traits that improve male appearance.
+Sexual dimorphism: Different characteristics between male and females to the point that they appear to be separate species.
+Intersexual selection: Females choose mates based on appearance/phenotype/behavior.
+Intrasexual selection: Competition between the same sex of same species to pass on DNA.
+
+Stabilizing selection: The intermediate phenotype is favored.
+Directional selection: Favors phenotypes at an extreme of the range, resulting in the curve being shifted towards that extreme.
+Disruptive selection: Both extremes are favored at the same time. Can eliminate the intermediate phenotype, resulting in speciation.
+![[Pasted image 20261113110619.png]]