Homework Answers
Answer-
Proboscipedia gene is an example of Homeotic gene.
Homeotic genes give segment identity in Drosophila. They encode homeodomain proteins which interact with Hox and other homeotic genes to initiate segment specific gene regulation.
Homeodomain proteins are transcription factors that share a DNA binding domain called homeodomain.
Two clusters of homeotic genes are used to give identity to Drosophila body segment: Antennapedia complex and Bithorax complex. Antennapedia cimplex gives rise to head, 1st and 2nd thoracic segments. It consists of labial, proboscipedia, deformed, sex comb reduced and antennapedia genes. Bithorax complex gives rise to 3rd thoracic segment and abdominal segments. It consists of ultrabithorax, abdominal A and abdominal B genes.
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Drosophila embryos with null mutations in the proboscipedia gene have their proboscis, a structure used in...
8. The correct sequence of segmentation gene action in the development of the Drosophila embryo is...
8. The correct sequence of segmentation gene action in the
development of the Drosophila embryo is
Select one: Gap Genes, then Pair-Rule Genes, then Segment Polarity Gene Gap Genes then Segment Polarity Genes, then Pair-Rule Genes Pair-Rule Genes, then Gap Genes, then Segment Polarity Genes Segment Polarity Genes, then Pair-Rule Genes, then Gap Genes Segment Polarity Genes, then Gap Genes, then Pair-Rule Genes Pair-Rule Genes then Segment Polarity Genes, then Gap Genes
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
Describe the differences and similarities in the gene families used by plants and animals to establish the body axis and...
Describe the differences and similarities in the gene families used by plants and animals to establish the body axis and to regulate gene expression of these gene sets. Drag the appropriate traits to their respective bins. Three respective bins: 1. Specific for plants. 2. Specific for animals 3. Common for plants and animals Traits are following: MADS-box proteins Three classes of homeotic genes (A, B, and C) Homeodomain-containing proteins Using regulatory genes encoding transcription factors Formation of organs is determined...
You have constructed a new reporter gene to help you find novel zebrafish mutations. The reporter...
You have constructed a new reporter gene to help you find novel zebrafish mutations. The reporter gene consists of several LEG/TCF binding domains in the enhancer fused to the coding region for green fluorescent protein (GFP). Wild-type embryos that contain this transgene normally express it in the brain and eye primordia and have no developmental defects. You then mutagenize this reporter strain to look for new mutants that affect GFP expression. Which developmental pathway are these mutants likely to be...
Most nonsense mutations in a structural gene for a protein have a null phenotype. How many...
Most nonsense mutations in a structural gene for a protein have a null phenotype. How many different single base substitution mutations in a protein coding sequence can produce a nonsense mutation?
4) RNA interference (RNAi) can be used to silence specific genes in specific tissues. You inject...
4) RNA interference (RNAi) can be used to silence specific genes in specific tissues. You inject various RNAi constructs into Drosophila embryos. in each of the following cases? (3pts) What effect on phenotype would you expect a) One gap gene silenced b) Bicoid silenced c) One Hox gene silenced
Which of the following statements regarding gene mutations is NOT true? Conditional mutations have different phenotypic...
Which of the following statements regarding gene mutations is NOT true? Conditional mutations have different phenotypic effects under different conditions and can be used to study the function of essential genes. Silent mutations cannot have any phenotypic effect on an organism. Frameshift mutations often result in a truncated protein product, similar to a nonsense mutation. Dominant mutations have a phenotypic effect despite the presence of one functional wild type allele.
In Drosophila, mutations in the genes serrate (Ser), dachs (d+), and eyeless (ey+) leads to abnormal...
In Drosophila, mutations in the genes serrate (Ser), dachs (d+), and eyeless (ey+) leads to abnormal wings, short legs, and blind flies, respectively. A cross between wild type flies and flies that display the serrate,dachs, and eyeless phenotypes results in an F1 that have abnormal wings. What are the expected genotypes if we cross F1 flies? What are the expected phenotypes ratios? Your peers decide to do the same exact F1 cross. Of a total of 1,000 flies, they obtain...
Developmental Biology Help! Please answer all the questions 1) We discussed the fact that each stripe...
Developmental Biology Help! Please answer all the questions 1) We discussed the fact that each stripe expression pattern is affected by the enhancer region that is utilized. Knowing that the maternal genes and the gap genes can both contribute to the pair-rule genes, and that in many cases multiple stripes may be contained in one area of GAP, how does the embryo have definition of stripes if all of these transcription factors can be within the same cell A it...
2. Three genes and their mutations are found on the third chromosome in fruit fly Drosophila...
2. Three genes and their mutations are found on the third chromosome in fruit fly Drosophila melanogaster. Of these three genes, scarlet eyes (st) are recessive to red eyes (st"), cbony body color (eb) is recessive to gray body color (eb"), and spineless (ss), the st presence of small bristles, is recessive to normal bristles (ss). You eb SS were given a heterozygous fly (st'st eb'eb ss'ss) and were asked to eb ss design an experiment to map the distance...
8. The correct sequence of segmentation gene action in the
development of the Drosophila embryo is
Select one: Gap Genes, then Pair-Rule Genes, then Segment Polarity Gene Gap Genes then Segment Polarity Genes, then Pair-Rule Genes Pair-Rule Genes, then Gap Genes, then Segment Polarity Genes Segment Polarity Genes, then Pair-Rule Genes, then Gap Genes Segment Polarity Genes, then Gap Genes, then Pair-Rule Genes Pair-Rule Genes then Segment Polarity Genes, then Gap Genes
4) RNA interference (RNAi) can be used to silence specific genes in specific tissues. You inject various RNAi constructs into Drosophila embryos. in each of the following cases? (3pts) What effect on phenotype would you expect a) One gap gene silenced b) Bicoid silenced c) One Hox gene silenced
2. Three genes and their mutations are found on the third chromosome in fruit fly Drosophila melanogaster. Of these three genes, scarlet eyes (st) are recessive to red eyes (st"), cbony body color (eb) is recessive to gray body color (eb"), and spineless (ss), the st presence of small bristles, is recessive to normal bristles (ss). You eb SS were given a heterozygous fly (st'st eb'eb ss'ss) and were asked to eb ss design an experiment to map the distance...
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