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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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- 7:01 Notepad Free Enter title... What is the lac operon? SAVE 4G 4 68% UNDOWhat is the difference between a repressible and an inducible operon?Cell and Molecular Biology Subject: 1. Explain how the actions of the lac operon are different from the trp operon. 2. Why is it important for a multicellular organism to be able to turn on only some of its genes in any particular tissue or cell type?
- 127. Whicn of the following statement concerning the regulator gene (i) associated with the lac operon is correct ? (1) MRNA is transcribed from the i-gene whether lactose is present or not. (2) MRNA is transcribed from the i-gene only when lactose is not present (3) Lactose inhibit the synthesis of mRNA from i-gene (4) Lactose promotes the synthesis of mRNA from i-genePredict the level of genetic activity of the lac operon as well as the status of the lac repressor and the CAP protein under the cellular conditions listed in the accompanying table. Lactose Glucose (a) - - (b) + - (c) - + (d) + +8:20 ■■ LTE < Spring 2024 - Senior Comprehensives (... Question 6ɔ (ividitudtory) In the Lac operon, what happens when allolactose attaches to the repressor protein? a) b) c) the repressor is induced to attach to the promoter RNA polymerase is induced to attach to the operator lactose synthesis enzymes are produced by genes Z, Y,A d) the repressor is inactivated Question 88 (Mandatory) What is the purpose of X-chromosome inactivation in mammals? a) It accomplishes dosage compensation. b) It assists in the interactions beteeen genes Tra and Dsx. c) It prevents trisomy from occurring. d) It produces the testis determination factor. Question 94 (Mandatory) Duchenne muscular dystrophy is inherited in an X- linked recessive pattern. A female is known to be heterozygous for Du muscular dystrophy XD xd
- 15b what is an attenuator? (in context of a prokaryotic operon )7.17 Contrast the regulation of an inducible operon with that of a repressible operon, and give an example of each.32/ What molecules thought to have performed double duty as a genetic materal and performing catalyss of chemical ARNA B proteins C polypeptides D DNA E both proteins and polypeptides
- Answer as Directed. Below is the model of a lac operon. lac I lac Z с promoter operator lac Y lac A DNA +1 1. What are structural genes? Are the lac structural genes transcribed in the absence of lactose? 2. What is the role of the promoter and operator sites in the operon? 3. Is the repressor protein bound to the operator site in the absence of lactose? In its absence? 4. Under what nutritional circumstances (high or low glucose) is CAP bound to cAMP? 5. In the absence of lactose and the presence of glucose in the bacterial growth media, what proteins are bound to the lac control region? Is the operon being transcribed then? 6. In the presence of lactose and the presence of glucose in the bacterial growth media, what proteins are bound to the lac regulatory region? Is the operon being transcribed then? 7. In the presence of lactose and the absence of glucose in the bacterial growth media, what proteins are bound to the lac control region? 8. Why is it adaptive for a bacterium to not…11c all three of the classes or types of eukaryotic transcriptional regulators have alpha helical structure. name any two of the three major classes of eukaryotic transcriptional regulators.Read aloud V Draw Highlight 2. You are studying the regulation of the lactose operon in Escherichia coli, by measuring expression of the lacZ gene (i.e production of beta-galactosidase). (a) You identify several loss-of-function mutations in which lacZ is never expressed, in the presence and absence of glucose and lactose. What components of the lac operon could be mutated to produce this phenotype? List all possibilities. (b) You identify another loss-of-function mutation with the following expression pattern: Media + glucose - lactose + glucose +lactose - glucose - lactose - glucose + lactose lacZ expression Low Low High High What components of the lac operon could be mutated to produce this phenotype? List all possibilities.