8. The correct sequence of segmentation gene action in the development of the Drosophila embryo is
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8. The correct sequence of segmentation gene action in the
development of the Drosophila embryo is...
Drosophila embryos with null mutations in the proboscipedia gene have their proboscis, a structure used in...
Drosophila embryos with null mutations in the proboscipedia gene have their proboscis, a structure used in feeding, replaced with legs. Given this phenotype, what type of developmental gene is proboscipedia likely to be? Gap Segment polarity Homeotic Pair-rule Maternal effect
1. What is the difference between a parasegment and segment in Drosophila development? a) Segments correspond...
1. What is the difference between a parasegment and segment in Drosophila development? a) Segments correspond to the anatomical divisions seen in larvae and adults, whereas parasegments are subdivisions of the embryo that correspond to regions or domains of gene expression. b) Parasegments correspond to the anatomical divisions seen in larvae and adults, whereas segments are subdivisions of the embryo that correspond to regions or domains of gene expression. 2. Which of the following statements about vertebrate Hox genes is...
The engrailed gene of Drosophila is expressed in 14 stripes in the embryo. This corresponds to...
The engrailed gene of Drosophila is expressed in 14 stripes in the embryo. This corresponds to a line of cells in each segment. If one makes a fly where all of the engrailed enhancers drive the expression of GFP (green fluorescent protein) you predict: A. The embryo will have evenly green fluorescence over its entirety. B. The embryo will have 7 stripes of green fluorescence. C. The embryo will have 14 stripes of green fluorescence. D. There will be no...
In Drosophila oocytes, concentrations of a gene product called nanos are high near the posterior and...
In Drosophila oocytes, concentrations of a gene product called nanos are high near the posterior and decline toward the head. nanos might be an example of a: A. Segment identity gene B. Homeotic gene C. Morphogen D. Pair rule gene E. Gap gene
2) What is the molecular reason that loss of expression of a single Hox gene due...
2) What is the molecular reason that loss of expression of a single Hox gene due to a mutation typically transforms the segment (or group of segments) into an anterior segmental fate? 3) Discuss the concept of a "molecular address" in the Drosophila cellular blastoderm stage embryo. Be sure to discuss both which genes are involved in setting up the address and which are involved in interpreting the address. 4) Explain the reason (at the level of molecules and regulatory...
Question 8 In chick development, the allantois is an outgrowth of the hindgut. O True False...
Question 8 In chick development, the allantois is an outgrowth of the hindgut. O True False Previous Question 9 The chick blastoderm is a hollow, spherical ball of cells and regional specification is describéd based on dorsoventral patterning. True False Next * Previous Question 10 Mutations in the homeotic genes of Drosophila can transform one body segment into another O True O False Question 11 The mouse blastocyst is essentially the same as the Xenopus blastula with a ball of...
During Drosophila development, adult structures are formed from clusters of cells called imaginal discs, which are...
During Drosophila development, adult structures are formed from clusters of cells called imaginal discs, which are recognizable during larval and pupal stages. You are interested in the genes expressed in imaginal discs, and you have identified two such genes that are closely linked together. • Gene 1 is expressed in the imaginal discs that will become the adult antennae. • Gene 2 is expressed in the discs that will become the adult wings and legs. A map of the two...
8) Bicoid and nano maternal genes play a role in the establishment of body anterior/posterior axes...
8) Bicoid and nano maternal genes play a role in the establishment of body anterior/posterior axes are formed in the fruit fly embryo? c) True d) False 9) What do hox genes act like? f) Control the polarity of the embryo and the formation of the anterior-posterior body axis of many animals (i.e. head to tail formation g) Act as genetic switches that turn on and off other genes, controlling the timing and route of development h) All of the...
m Review Traditional gene mapping has been applied successfully to a variety of organisms including yeast,...
m Review Traditional gene mapping has been applied successfully to a variety of organisms including yeast, fungi, maize, and Drosophila. However, human gene mapping has only recently shared a similar spotlight. - Part A What factors have delayed the application of traditional gene-mapping techniques in humans? Select the four correct answers. In humans, the haploid number of chromosomes is relatively low. Many human genes show epistasis or incomplete dominance. Gene expression in humans strongly depends on the conditions of fetal...
You are a graduate student in the lab of a famous fly geneticist. You need to...
You are a graduate student in the lab of a famous fly geneticist. You need to analyze a batch of mutant flies that were recently created in her laboratory to identify the single gene that is most likely mutated in each of the flies. Drag the mutations on the left to the appropriate blanks on the right to complete the sentences. Help Reset hunchback (a gap gene) even-skipped (a pair-rule gene) wingless (a segment-polarity gene) knirps (a gap gene) hedgehog...
Drosophila embryos with null mutations in the proboscipedia gene have their proboscis, a structure used in feeding, replaced with legs. Given this phenotype, what type of developmental gene is proboscipedia likely to be? Gap Segment polarity Homeotic Pair-rule Maternal effect
2) What is the molecular reason that loss of expression of a single Hox gene due to a mutation typically transforms the segment (or group of segments) into an anterior segmental fate? 3) Discuss the concept of a "molecular address" in the Drosophila cellular blastoderm stage embryo. Be sure to discuss both which genes are involved in setting up the address and which are involved in interpreting the address. 4) Explain the reason (at the level of molecules and regulatory...
Question 8 In chick development, the allantois is an outgrowth of the hindgut. O True False Previous Question 9 The chick blastoderm is a hollow, spherical ball of cells and regional specification is describéd based on dorsoventral patterning. True False Next * Previous Question 10 Mutations in the homeotic genes of Drosophila can transform one body segment into another O True O False Question 11 The mouse blastocyst is essentially the same as the Xenopus blastula with a ball of...
During Drosophila development, adult structures are formed from clusters of cells called imaginal discs, which are recognizable during larval and pupal stages. You are interested in the genes expressed in imaginal discs, and you have identified two such genes that are closely linked together. • Gene 1 is expressed in the imaginal discs that will become the adult antennae. • Gene 2 is expressed in the discs that will become the adult wings and legs. A map of the two...
8) Bicoid and nano maternal genes play a role in the establishment of body anterior/posterior axes are formed in the fruit fly embryo? c) True d) False 9) What do hox genes act like? f) Control the polarity of the embryo and the formation of the anterior-posterior body axis of many animals (i.e. head to tail formation g) Act as genetic switches that turn on and off other genes, controlling the timing and route of development h) All of the...
m Review Traditional gene mapping has been applied successfully to a variety of organisms including yeast, fungi, maize, and Drosophila. However, human gene mapping has only recently shared a similar spotlight. - Part A What factors have delayed the application of traditional gene-mapping techniques in humans? Select the four correct answers. In humans, the haploid number of chromosomes is relatively low. Many human genes show epistasis or incomplete dominance. Gene expression in humans strongly depends on the conditions of fetal...
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