Ch 24.4 Types of Selection

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Helps students answer the following questions: Clearly explain the concepts of disruptive, stabilizing, balancing, directional, and sexual selection on a population. Explain what must happen to produce these selective pressures and how it affects the population.

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Kyla Cymone

United States

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Ch 24.4 Types of SelectionOnline version Helps students answer the following questions: Clearly explain the concepts of disruptive, stabilizing, balancing, directional, and sexual selection on a population. Explain what must happen to produce these selective pressures and how it affects the population. by Kyla Cymone 1 Stabilizing Selection 2 Disruptive Selection 3 Directional Selection 4 Sexual Selection 5 Balancing Selection favors intermediate types Environment consists of rocks of in intermediate color acts against extreme phenotypes causes a reduction in variation makes population a blend of both extremes babies born lower or above the optimal weight range have a higher risk of mortality favors extreme phenotypes acts against intermediate types Environment made up of patchy habitat of light & dark rocks makes the population more distinct on both ends of the spectrum black-bellied seedcracker finches w/ intermediate beaks inefficient at cracking soft and hard seeds Favors darker mice acts against lighter and intermediate types environment is made of darker rocks make the population more uniform in one extreme direction An increase in number of large seeds over small led to increase in beak depth in Galápagos finches Can occur when population migrates to different area with opposite environmental conditions does not have to relate to survival in the environment directly mates choose which phenotypes are preferred peacocks choosing males with larger feathers, despite it not being advantageous for survival can cause sexual dimorphism in a population caused by variation in reproductive fitness chosen via intrasexual or intersexual selection replies on heterozygote advantage and is frequency dependent left & right mouthed fish in Lake Tanganyika that bite off scales to compete for food on other fish heterozygotes for sickle celled have enough sickled & normal blood cells to defend against malaria effect on population depends on how genotype effects phenotype can cause stabilizing or directional selection directly

Ch 24.4 Types of SelectionOnline version

by Kyla Cymone

Stabilizing Selection

Disruptive Selection

Directional Selection

Sexual Selection

Balancing Selection

favors intermediate types

Environment consists of rocks of in intermediate color

acts against extreme phenotypes

causes a reduction in variation

makes population a blend of both extremes

babies born lower or above the optimal weight range have a higher risk of mortality

favors extreme phenotypes

acts against intermediate types

Environment made up of patchy habitat of light & dark rocks

makes the population more distinct on both ends of the spectrum

black-bellied seedcracker finches w/ intermediate beaks inefficient at cracking soft and hard seeds

Favors darker mice

acts against lighter and intermediate types

environment is made of darker rocks

make the population more uniform in one extreme direction

An increase in number of large seeds over small led to increase in beak depth in Galápagos finches

Can occur when population migrates to different area with opposite environmental conditions

does not have to relate to survival in the environment directly

mates choose which phenotypes are preferred

peacocks choosing males with larger feathers, despite it not being advantageous for survival

can cause sexual dimorphism in a population

caused by variation in reproductive fitness chosen via intrasexual or intersexual selection

replies on heterozygote advantage and is frequency dependent

left & right mouthed fish in Lake Tanganyika that bite off scales to compete for food on other fish

heterozygotes for sickle celled have enough sickled & normal blood cells to defend against malaria

effect on population depends on how genotype effects phenotype

can cause stabilizing or directional selection directly

You can integrate the game into an LMS compatible with LTI 1.1 or LTI 1.3 such as Canvas, Moodle, or Blackboard. This way, the scores will be automatically saved into the platform’s gradebook.

Ch 24.4 Types of Selection

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About this activity

Created by

Download the paper version to play

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Ch 24.4 Types of SelectionOnline version

by Kyla Cymone

Stabilizing Selection

Disruptive Selection

Directional Selection

Sexual Selection

Balancing Selection

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