Evolutionary Mechanisms

A plant breeder crosses two pea plants from the same strain, and then plants the seeds they produce. Which observation below suggests that a mutation occurred in the genes of one of the parent plants?

• A plant that is nearly identical in all traits to one of its parents.

• Plants that produce orange peas, a color never before observed in this strain.

• Plants that produce peas that are green and wrinkled, a rare trait for this strain.

• Several plants that have a combination of the traits of the two parents.

Which of the following describes how genetic recombination affects evolution? Recombination -

• creates a decrease in genetic variability and speeds up the rate of evolution.

• generates new pairings of genes, increasing genetic variability for selection to act on.

• slows down genes flow from one population to another, resulting in fewer new species.

• regulates a gene pool to keep the variability constant over time, ensuring population’s genetic health.

Which of the following is an example of the bottle neck effect?

• Bald Eagles are hunted until near extinction, pop recovers
• Small group of iguanas floats to an island, starts a new pop
• Environ of red fox pop now snowy, gen later pop is all white
• farmer chooses seeds from largest apples to plant next gen.

Which of the following is an example of the founder effect?

• Bald Eagles are hunted until near extinction, population recovers

• Small group of iguanas float to an island, starting a new population

• Environment of red fox population is now snowy, generations later, the population is all white

• farmer chooses seeds from largest apples to plant next gen.

 Genetic Drift is more likely to happen in... 

• aquatic populations
• small populations
• terrestrial populations
• older populations

All the different genes and traits in a population.

• Genetic Flow
• Natural Selection
• Evolution
• Gene Pool

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When organisms selects their mates based on traits- ex. bright coloring, feather size, and sounds

• Natural Selection
• Inbreeding
• Gene Flow
• Non-random Mating

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Sharks and dolphins both have streamlined bodies that allow them to move through water efficiently, this is an example of which type of evolution?

• Divergent
• Coevolution
• Convergent
• Artificial

Individuals that survive long enough to reproduce have a high level of

• fitness
• adaptation
• hormones
• stamina

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How does genetic variation arise in a population/species?

• Crossing over / Sexual reproduction

• Mutation

• Neither

• Both

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