2019 STAAR Biology Test

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What is genetic diversity?

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Genetic diversity refers to the total number of genetic characteristics in the genetic makeup of a species. It is important for the survival and adaptability of a species.

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What is genetic drift?

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Genetic drift is a mechanism of evolution that refers to random changes in the frequency of alleles in a population, which can lead to a loss of genetic diversity.

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What is the consequence of low genetic diversity in a population?

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Low genetic diversity can make a population less resilient to environmental changes and diseases, increasing the risk of extinction.

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What is active transport in cellular biology?

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Active transport is the process of moving molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy (ATP).

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What is facilitated diffusion?

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Facilitated diffusion is the process of passive transport of molecules across a cell membrane via specific transmembrane integral proteins, without the use of energy.

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What is osmosis?

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Osmosis is the movement of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

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What is parasitism?

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Parasitism is a symbiotic relationship where one organism (the parasite) benefits at the expense of another organism (the host).

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What is competition in ecology?

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Competition occurs when two or more species or individuals vie for the same resources (such as food, space, or mates) in an ecosystem.

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What is mutualism?

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Mutualism is a symbiotic relationship where both organisms involved benefit from the interaction.

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What is an autosomal dominant trait?

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An autosomal dominant trait is a trait that is expressed when at least one dominant allele is present in an individual's genotype.