How Genes and the Environment Affect Phenotypic Expression (HSC SSCE Biology): Flashcards

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How Genes and the Environment Affect Phenotypic Expression
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Phenotype

Observable characteristics: structure, behavior, physiology

Genotype

Genetic information (DNA sequences) an organism possesses

Epigenetics

Chemical changes to DNA affecting gene expression, not sequence

Gene expression

Converting genetic info into functional protein products

Pluripotent

Can give rise to any type of tissue (embryonic stem cells)

Siamese cat coat color & temp

Cold extremities = dark pigment; warm areas = no dark pigment

Hydrangea flower color & pH

Acidic soil = blue flowers; alkaline soil = pink flowers

Methylation effect on genes

Adds CH3-CH_3 group; represses transcription; silences genes

Acetylation effect on genes

Makes DNA accessible to RNA polymerase; promotes transcription

6 stages of gene regulation

Chromatin, transcription, RNA process, stability, translation, mod

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