Amoeba Sisters Natural Selection

Antibiotics are designed to target? 

• Prokaryotic cells (bacteria)

• Eukaryotic cells

• Viruses

A species can...

• Breed with each other

• Pass down DNA to offspring

• Have a variety of traits

• All of these are true

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Which frog has a selective advantage?

• The dark frogs

• The light frogs

• all frogs are equal

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Biological fitness is determined by

• how long the frog lives

• the number of offspring the frogs have

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If the same patterns continue for a very long time, 

• the lighter frogs will eventually make a come back

• all of the frogs may be darker

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What is evolution? 

• Change over time (long- millions of years)

• Organisms adapting to their environment

• Change over time (within an organism's lifespan)

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The alleles for lighter colored frogs do not disappear from the population completely.  They are less common. Which allele has a selective advantage?

• G

• g

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Mutations and variations cannot be controlled by the organism - they cannot make mutations happen. Frogs cannot decide to be a different color to help them survive. Where do these mutations and variations (that will affect fitness and offspring) come from?

• DNA

• Environment

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If a mutation causes an organism to survive longer and have more babies than an organism without the mutation, it can be said that the mutation has a

• positive effect

• negative effect

• no effect

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Bacteria have genes and DNA, too.  If they have random mutations that give them a stronger cell wall or enzymes, they are LESS likely to die from antibiotics. This means that when we take antibiotics, only the mutated bacteria SURVIVE.  These bacteria have fitness, which means

• They will not survive nor will their offspring

• Their bacteria offspring will survive as well

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