3-28 Vocab Review

Define natural selection:

• Traits become less frequent in a population if they help an organism survive and reproduce in the environment

• Traits become more frequent in a population if they help an organism survive and reproduce in the environment

• Traits become less frequent in a population if organisms use that trait during their life

• Traits become more frequent in a population if organisms use that trait during their life

Which of the following is NOT an example of natural selection?

• People selectively breeding hamsters

• Bacteria becoming resistant to antibiotics

• Insect populations developing resistance to certain pesticides

• Male birds of certain species developing colorful feathers to attract mates

Define phenotype:

• Observable traits

• Genes for traits

• Physical traits

• Alleles for traits

Define genetic variation:

• Range of similarities in evolutionary pathways

• Range of similarities in traits across different species

• Range of differences in DNA within a population

• Range of differences in mutations within a species

Define directional selection:

• Extreme forms of a trait are favored over intermediate values and the population is divided into two distinct phenotypes

• An extreme phenotype is favored over other phenotypes

• Phenotypes selected for by humans become more prevalent

• Intermediate forms of a trait are favored and more extreme values are selected against

Define stabilizing selection:

• Extreme forms of a trait are favored over intermediate values and the population is divided into two distinct phenotypes

• An extreme phenotype is favored over other phenotypes

• Phenotypes selected for by humans become more prevalent

• Intermediate forms of a trait are favored and more extreme values are selected against

Define disruptive selection:

• Extreme forms of a trait are favored over intermediate values and the population is divided into two distinct phenotypes

• An extreme phenotype is favored over other phenotypes

• Phenotypes selected for by humans become more prevalent

• Intermediate forms of a trait are favored and more extreme values are selected against

Define coevolution:

• The evolution of characteristics in two individuals of the same species

• The evolution of characteristics in two species that are geographically separated

• The evolution of characteristics in two species that interact with each other

• The evolution of characteristics in two parts of an organism’s body

Rock pocket mouse fur color is a result of:

• Directional selection

• Stabilizing selection

• Disruptive selection

• Coevolution

Peppered moth coloration is a result of:

• Directional selection

• Stabilizing selection

• Disruptive selection

• Coevolution