7) Which of the following needs to occur for transcription to take place in prokaryotes? A) The RNA polymerase must recognize the promotor sites that typically occur upstream of the start of transcription at approximately -35 and -10 base pairs. B) The sigma factor protein must be absent for RNA polymerase to bind to the promotor site. C) An enhancer site must be activated upstream of the promotor site. D) Molecules outside the nucleus must trigger transcription factors located on the DNA. X X X XX Homologous chromosomes can line up in two ways during metaphase of mesosia 1 D000 8) The image above demonstrates A) linked genes X B) the principle of independent assortment C) the central dogma of molecular biology D) the law of dominance XX X 9) Which of the following statements is true? A) A recessive trait will never be the most common phenotype in a population, regardless of environment. CB Dominant traits are always the most common phenotype in a population, regardless of environment. C) Over time, recessive traits tend to disappear from a population if the environment doesn't change. D) A recessive trait can be the most common phenotype in a population if it is most beneficial in an environment.
Gene Interactions
When the expression of a single trait is influenced by two or more different non-allelic genes, it is termed as genetic interaction. According to Mendel's law of inheritance, each gene functions in its own way and does not depend on the function of another gene, i.e., a single gene controls each of seven characteristics considered, but the complex contribution of many different genes determine many traits of an organism.
Gene Expression
Gene expression is a process by which the instructions present in deoxyribonucleic acid (DNA) are converted into useful molecules such as proteins, and functional messenger ribonucleic (mRNA) molecules in the case of non-protein-coding genes.


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