week when I mutated the SSA1 gene in yeast it made cells grow faster, but made them sensitive to temperature. SSA1 can be said to display what? a. Antagonistic hypertrophy b. Agonistic pleiotropy c. Agonistic hypertrophy d. Antagonistic pleiotropy e. Reductive pleiotropy f. Modular pleiotropy
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Last week when I mutated the SSA1 gene in yeast it made cells grow faster, but made them sensitive to temperature. SSA1 can be said to display what?
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- How can one most effectively silence the myofilament gene unc-22 in C. elegans to produce the twitching phenotype? O A. Screen thousands of strains for a spontaneous unc-22 mutation O B. Soak worms in mutagenic solutions of EMS and screen the progeny OC. Inject antisense strands of unc-22 RNA into worm ovaries, which will be taken up by germ line cells and expressed in progeny O D. Inject a high dose of unc-22 MRNA into worm ovaries, which will be taken up by germ line cells and expressed in progeny O E. Culture worms with E. coli transformed with a plasmid that codes for a dsRNA unc-22 constructa. Explain how you could use worms transformedwith myo-2::GFP to find mutations that disrupt thestructure of the pharynx. How would the presenceof the transgene facilitate the mutant screen?b. Nematodes homozygous for loss-of-function mutations in a gene called pha-4 have no detectablepharyngeal structures. How could you use myo2::GFP to determine if pha-4 is a master regulatory gene that directs development of the pharynxin a manner similar to the way Pax-6/eyeless controls eye development?You are a developmental geneticist studying flowering time variation in Arabidopsis. You perform a mutagenesis screen to identify mutants in the photoperiod pathway. You conduct the screen and find two different plants that show the same mutant phenotype. You then use a complementation test. What is the predicted outcome of this test if both phenotypes are caused by mutations in separate genes? recover the wild type phenotype overexpress the gene O recover the mutant phenotype
- You have isolated a strain of mutant yeast cells that divide normally at 25 degrees Celsius but cannot ente4 M phase at 37 degrees Celsius. You found that the gene for M cdk is not mutated. Which of the following temperatures sensitive mutations could be responsible for the.behavior of this strain of yeast? Inactivated of an enzyme that normally degrades m cyclin; Inactivated of a protein that normally triggers the synthesis of m cyclin; Inactivated of a protein kinase that normally Inactivate the cdk; none 2. Which of the following statements about the anaphase promoting complex is false? It promotes the degradation of proteins that activates mitosis; it inhibits m cdk activities; it becomes active at the very beginning of metaphase; it is activated by m cdk 3. During cancer development:.? Cells accumulate mutations in a fixed order which results in increase rate of cell division; the inheritance of mutations caused by dna damage is essential for cancer progression; there is typically…In roses, the synthesis of red pigment is by two steps ina pathway, as follows:colorless intermediate gene Pmagenta intermediate red pigment gene Qa. What would the phenotype be of a plant homozygousfor a null mutation of gene P?b. What would the phenotype be of a plant homozygousfor a null mutation of gene Q?c. What would the phenotype be of a plant homozygousfor null mutations of genes P and Q?d. Write the genotypes of the three strains in parts a, b,and c.e. What F2 ratio is expected from crossing plants fromparts a and b? (Assume independent assortment.)g protein D. Growth factor receptor ng Tool 0 Q ing C. Growth factor-binding protein D. Growth factor receptor E. Transcription activator A child with retinoblastoma is found to have a 13q14 deletion. The Rb gene, which resides at this locus, produces which kind of tumor-associated protein? A. Cell cycle regulator B. Growth factor ㅂ분 요 9 12 W □ @ 2 C Edit in Paint 8 60 8 Focus
- 19: What are 3 phenotypes of GA, or BR, or ABA, or CK over-producing mutants. 20: Think about a hormone receptor, specifically the structure of the receptor. Describe ONE why a mutation would cause insensitivity to the hormone, AND ONE way it could cause hypersensitivity to the hormone. Explain your answer to each. 22: Not all cells in tissues are the same. They differentiate from stem cells. Describe how ONE cell type acquires cell identity. (Pick any cell in the plant)4e. You also study the expression of 3 different mutants for this gene. For each mutant answer the following: Does this mutation change the sequence of the protein produced? Why or why not? If it does change the sequence of protein be sure to write out the new sequence. If it does not change the protein sequence, what effect (if any) would you expect it to have on expression of the gene? 1 20 ORI 40 60 5'..TTCGAGCTCTCGTCGTCGAGATACGCGATGATATTACTGGTAATATGGGGATGCACTATC...3’ 3'...AAGCTCGAGAGCAGCAGCTCTATGCGCTACTATAATGACCATTATACCCCTACGTGATAG...5’ promoter i. Mutant A has a single base pair substitution with the T/A being replaced with C/G base pair at position 35 (position denoted by the * in the sequence above). ii. Mutant B has a 2 G/C pairs inserted between position 19 and 20 (position denoted by the ^ in the sequence above).1A.If transcription factor G is downstream of EGFR and upregulates gene H, what happens to H if Grb2 has an ER signal sequence? 1B. If transcription factor A is phosphorylated by Akt and upregulates gene B, what happens to gene B if a PI3K inhibitor is added? Choices are: A. No expression of the gene B. Upregulation even in the absence of stimulation/ EGF C. Upregulation but only in the presence of cytokine/ EGF
- 1. Match each of the terms in the left column to the bestfitting phrase from the right column.a. epistatic interaction 1. divide the body into identical units(segments)b. regulative 2. initiated by binding of ligand todetermination receptorc. modifier screen 3. individuals with cells of more thanone genotyped. RNAi 4. the fate of early embryonic cells canbe altered by the environmente. ectopic expression 5. assign identity to body segmentsf. homeodomain 6. substance whose concentrationdetermines cell fatesg. green fluorescent 7. suppression of gene expression byprotein double-stranded RNAh. genetic mosaics 8. method for identifying pleiotropicgenesi. segmentation genes 9. a DNA-binding motif found incertain transcription factorsj. homeotic genes 10. encode proteins that accumulate inunfertilized eggs and are needed forembryo developmentk. morphogen 11. double mutant has phenotype of oneof the two mutantsl. maternal effect 12. a gene is turned on in an inappropriategenes tissue or at…4e. You also study the expression of 3 different mutants for this gene. For each mutant answer the following: Does this mutation change the sequence of the protein produced? Why or why not? If it does change the sequence of protein be sure to write out the new sequence. If it does not change the protein sequence, what effect (if any) would you expect it to have on expression of the gene? 1 20 ORI 40 60 5'...TTCGAGCTCTCGTCGTCGAGATACGCGATGATATTACTGGTAATATGGGGATGCACTATC...3' 3' ...AAGCTCGAGAGCAGCAGCTCTATGCGCTACTATAATGACCATTATACCCCTACGTGATAG...5' * promoterGene Vellow Pigment ,in some plants White By-product ENZYME Rabbits that have the active form of this gene produce white-colored fat. Rabbits who have the defective form of this gene produce yellow- colored fat. However, there is an environmental complication of this trait. (See the following questions.) 1. If a rabbit that has the active form of the gene is fed plants with the pigment, what color is its fat? 2. If a rabbit with the defective gene is fed plants with the pigment, what çolor is its fat?