GENETIC ANALYSIS: INTEGRATED - ACCESS
3rd Edition
ISBN: 9780135349298
Author: Sanders
Publisher: PEARSON
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Chapter 10, Problem 11P
In what way does position effect variegation (PEV) of Drosophila eye color indicate that chromatin state can affect gene transcription?
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Explain the Retrotransposons—the Copia –White-Apricot System in Drosophila ?
You are interested in studying position effect variegation in Drosophila using the chromosome depicted below:
Deactivation of the w+ gene gives a white eye phenotype and deactivation of the rst+ gene gives a rough eye
phenotype; the normal phenotypes are red and smooth. Because the rst+ and w+ genes have now been placed
close to a heterochromatic domain, some sections (or sectors) of the eye display mutant phenotypes due to gene
deactivation while others display the normal, wild type phenotype. Which phenotype would you not expect to see
rst w
Inverted X chromosome
white smooth eye sectors
white rough eye sectors
red smooth eye sectors
red rough eye sectors
Recalling the eye pigment pathway in Drosophila, identify the phenotypes of the flies with the following genotypes. (w=white, bw=brown, cn=cinnabar red, st=scarlet red, se=sepia brown)
Chapter 10 Solutions
GENETIC ANALYSIS: INTEGRATED - ACCESS
Ch. 10 - 10.1 Give descriptions for the following...Ch. 10 - 10.2 The human genome contains contains base...Ch. 10 - In eukaryotic DNA, Where are you most likely to...Ch. 10 - 10.4 Describe the importance of light and dark G...Ch. 10 - Human late prophase karyotypes have about 2000...Ch. 10 - Prob. 6PCh. 10 - From the following list, identify the types...Ch. 10 - 10.8 If the haploid number for a plant species is...Ch. 10 - Mating between a male donkey (2n=64) and a female...Ch. 10 - A researcher interested in studying a human gene...
Ch. 10 - 10.11 In what way does position effect variegation...Ch. 10 - 10.12 A pair of homologous chromosomes in...Ch. 10 - 10.13 An animal heterozygous for a reciprocal...Ch. 10 - Dr. Ara B. Dopsis has an idea he thinks will be a...Ch. 10 - A normal chromosome and its homolog carrying a...Ch. 10 - The accompanying chromosome diagram represents a...Ch. 10 - 10.17 Histone protein isolated from pea plants...Ch. 10 - 10.18 A survey of organisms living deep in the...Ch. 10 - In humans that XX/XO mosaics, the phenotype is...Ch. 10 - 10.20 A plant breeder would like to develop the...Ch. 10 - In Drosophilia, seven partial deletion (1to7)...Ch. 10 - Two experimental varieties of strawberry are...Ch. 10 - 10.23 In the tomato, Solanum esculentum, tall ()...Ch. 10 - A boy with Down syndrome (trisomy 21) has 46...Ch. 10 - Experimental evidence demonstrates that the...Ch. 10 - Prob. 26PCh. 10 - Genomic DNA from the nematode worm...Ch. 10 - 10.28 A small population of deer living on an...Ch. 10 - A eukaryote with a diploid number of 2n=6 carries...Ch. 10 - Prob. 30PCh. 10 - For the following crosses, determine as accurately...Ch. 10 - A healthy couple with a history of three previous...
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- Outline the role of alternative splicing in the control of sex differentiation in Drosophila.arrow_forwardWhat is the signaling pathway that mediates the organizing activity of the A/P organizer in the Drosophila wing disc? Describe two experiments that suggest this pathway functions to organize pattern and promote growth along the anterior/posterior axis of wing imaginal discs.arrow_forwardDescribe how methylation and acetylation of the histones changes gene expression in eukaryotes. What groups are added? How do these processes physically affect chromatin structure? Silencing or Enhancing expression?arrow_forward
- Explain how alternative splicing affects sex determination in Drosophila.arrow_forwardExplain how the Sxl promoter “counts” the number of Xchromosomes in Drosophila.arrow_forwardUse the dropdowns to indicate the pattern of methylation and gene expression expected for a maternally-imprinted gene in the somatic cell of a male individual. The Somatic cell would show [Select] male's male parent, and [Select] male's female parent. As a result, [Select] of the allele inherited from the of the allele inherited from the could be expressed. The pattern of methylation would be [Select] imprinted gene in a somatic cell of a female individual. for the same maternally-arrow_forward
- Has the DNA sequence of the eye color gene been changed in part (b) compared with part (a)? How do we explain the phenotypic difference?arrow_forwardBelow is a schematic diagram showing a 3000 bp region of yeast genomic DNA. TSS 5' 3' 5' +1 (i) Draw and name specific regions in this schematic diagram that can be recognized by Transcription factor IID (TFIID). (ii) How does Transcription factor IIH (TFIIH) initiate the transcription? in inarrow_forwardPlease explainarrow_forward
- Please explainarrow_forwardPlease Explainarrow_forwardIn Drosophila subobscura, the presence of a recessive gene called grandchildless (gs) causes the offspring of homozygous females, but not those of homozygous males, to be sterile. Can you offer an explanation as to why females and not males are affected by the mutant gene?arrow_forward
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