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
What is the expected phenotype when one of the following mutations occurs, either in Drosophila melanogaster...
What is the expected phenotype when one of the following mutations occurs, either in Drosophila melanogaster or in Arabidopsis thaliana? (i) Overexpression of both bicoid and nanos in a female fly. (ii) Overexpression of the homeotic gene, antennapedia, in a female fly lacking hunchback. (iii) Deletion of the pair-rule gene, even-skipped, in a male fly overexpressing nanos. (iv) Overexpression of the Class A gene, APETALA1, in a plant lacking the Class B gene, APETALA3. (v) Overexpression of the Class C...
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?
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.
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. A dominant allele H reduces the number of body bristles that Drosophila flies have, giving...
2. A dominant allele H reduces the number of body bristles that Drosophila flies have, giving rise to a “hairless” phenotype. In the homozygous condition, H is lethal. An independently assorting dominant allele S has no effect on bristle number except in the presence of H, in which case a single dose of S suppresses the hairless phenotype, thus restoring the "hairy" phenotype. However, S also is lethal in the homozygous (S/S) condition. What ratio of hairy to hairless flies...
INTRODUCTION New mutations that arise on the X chromosome can have different likelihoods of becoming fixed...
INTRODUCTION
New mutations that arise on the X chromosome can have different
likelihoods of becoming fixed in the population than their
autosomal counterparts. This differential likelihood arises because
the effect of a recessive mutation on an autosome is only expressed
in homozygotes, whereas the effect of a similar recessive mutation
that arises on the X chromosome in a male is fully expressed. Thus,
advantageous recessive mutations are more likely to become fixed if
they are on the X chromosome than...
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
INTRODUCTION
New mutations that arise on the X chromosome can have different
likelihoods of becoming fixed in the population than their
autosomal counterparts. This differential likelihood arises because
the effect of a recessive mutation on an autosome is only expressed
in homozygotes, whereas the effect of a similar recessive mutation
that arises on the X chromosome in a male is fully expressed. Thus,
advantageous recessive mutations are more likely to become fixed if
they are on the X chromosome than...
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