stream of their coding sequence. The interaction of these enhancers with specific pression. Gene A Gene B Tissue 1 OFF ON Tissue 2 ON OFF ese two genes are expressed differentially in two different tissues (tissue 1 and til
stream of their coding sequence. The interaction of these enhancers with specific pression. Gene A Gene B Tissue 1 OFF ON Tissue 2 ON OFF ese two genes are expressed differentially in two different tissues (tissue 1 and til
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Concept explainers
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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
Transcribed Image Text:Two eukaryotic genes (A and B) are involved in two different metabolic pathways, and each has a control element sequence (enhancer)
upstream of their coding sequence. The interaction of these enhancers with specific transcription factors determines the level of gene
expression.
Gene A
Gene B
Tissue 1
OFF
ON
Tissue 2
ON
OFF
These two genes are expressed differentially in two different tissues (tissue 1 and tissue 2) according to the table below.
What can explain this pattern of gene expression?
a) Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express the same transcription
factors (at the same concentration and at the same time).
b) Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2 express different transcription
factors.
c) Gene A and gene B belong to the same operon.
d) Gene A and B have the same control element sequences and the cells of tissue 1 and tissue 2 express the same transcription
factors (at the same concentration and at the same time).
e) Gene A and B have different control element sequences and the cells of tissue 1 and tissue 2 express different transcription
factors.
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