Unit 5 Study Guide

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24 Terms

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Chromosome

A condensed structure made of DNA that carries genetic information.

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Meiosis

The process of cell division that produces gametes with half the chromosome number.

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Genetic Variation

Differences in genetic material within a population.

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DNA

Molecule storing genetic information, found in chromosomes.

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Protein Synthesis

Process of translating DNA information into proteins.

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Central Dogma

The flow of genetic information from DNA to RNA to proteins.

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Allele

Different forms of a gene that occur at a specific locus on chromosomes.

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Punnett Square

Tool for determining the probability of genotypes and phenotypes in offspring.

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Gene Expression

Process of transcribing DNA into mRNA to produce proteins.

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Inducible operon

Operon that is activated in the presence of a specific molecule or substance.

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Repressible operon

Operon that is deactivated in the presence of a specific molecule or substance.

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Histones

Proteins around which DNA is tightly wound in eukaryotic cells.

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Epigenome

Chemical compounds that influence the accessibility of genes to transcription enzymes, regulating gene expression.

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Transcription factors

Proteins that bind to DNA sequences, controlling the rate of transcription and initiating RNA polymerase activity.

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Enhancers

DNA sequences that accelerate the transcription process.

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Silencers

DNA sequences that decelerate the transcription process.

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Introns

Non-coding segments of DNA that are removed during mRNA processing.

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Exons

Coding segments of DNA that are spliced together during mRNA processing.

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5’ cap

Nucleotide structure added to the front of mRNA to facilitate ribosome binding and prevent mRNA degradation.

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Poly-A tail

Nucleotide structure added to the end of mRNA to enhance stability and aid in nuclear export.

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Translational regulation

Regulation of gene expression that occurs during protein synthesis in the cytoplasm, affecting translation efficiency.

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Polygenetic traits

Traits influenced by multiple genes.

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Epistasis

Genes that alter the expression of other genes.

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Internal factors

Factors within an organism that can impact gene expression.