Which of these statements about the effect of environment on gene expression is false?Signal molecules produced by one cell can affect gene expression in other cells.Some phenotypic traits are relatively unaffected by differences in environmental conditions.Genes in one part of an organism can be exposed to different environments than other parts.The environment that can affect a gene only refers to conditions immediately surrounding
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Environmental influences on gene expression Complete the following paragraph to describe the effects of the environment on gene expression.
Madhur L.
Which of the following best describes how the environment may play a role in the expression of our genes? The environment is not able to alter genes or their physical expressions. Genotypes and phenotypes are both completely independent of environmental changes, unless in the form of mutations. All genes are directly influenced by the environment, even if only in minor ways, so the environment will always alter phenotype for all genes The environment can alter an individual's appearance, but because these changes are temporary and unable to be inherited, they have no impact on the genotype or the expression of that genotype. Some phenotypes, including skin color, can be influenced by the environment. The genotype still determines some aspect of skin color, but the interaction with the environment, in the form of sun exposure, can cause variations in the resulting phenotype.
Select all of the following statements that are TRUE: Cells have a particular gene expression program, e.g. it's what makes a liver cell different from a nerve cell; therefore, transcription factors often have constitutive "always on" nuclear localization signals. Cells must respond to a variety of intracellular and extracellular signals, it's how organisms respond to their environment and different cell types interact in multicellular organisms; therefore, nuclear import of many transcription factors is regulated. The activity of transcription factors is often regulated in other ways besides nuclear import/export; therefore, transcription factors often have constitutive "always on" nuclear localization signals.
Adi S.
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