The easily observed external structures in insects, such as different pairs of legs, antennae, and wings form from imaginal discs. a.) How is the identity of the different Drosophila imaginal discs established in the embryo—for example, how is it determined whether a disc will form a wing, a leg, or some other structure? b.) Dominant mutants in the gene Antennapedia result in fore legs forming in the location where antennae are expected. How does this mutant phenotype illustrate your response to Part a?

Q: A number of genes that control expression of Hox genes in Drosophila have been identified. One of…

A: Homeotic genes are the regulatory genes that play an important role in the regulation of the…

Q: How did mutations in the Drosophila ANT-C gene complex provide researchers with information on the…

A: The embryonic development of drosophila is regulated by differential gene expression. These flies…

Q: aternal effect gene in Drosophila, called torso, is found as a recessive allele that prevents the…

A:

Q: Below are the DNA sequences that encode the first eight amino acids for five alleles of the Adh…

A: Genes contain the information that is required for the translation of a functional protein inside…

Q: Illustrate the Parental and F1 cross

A: Trihybrid cross is between the two individuals of a species for studying inheritance of three pairs…

Q: As a volunteer in a genetics lab, Professor Uhura tasked you with testing the biparental…

A: Introduction: Drosophila melanogaster is a species of fly in the family Drosophilidae. The species…

Q: What is the pseudoautosomal region? How does the inheritance of traits encoded by genes in this…

A: The male chromosome has a single X chromosome and a Y chromosome. Y chromosome is acrocentric and…

Q: A condition known as icthyosis hystrix gravior appeared in a boy in the early eighteenth century.…

A: It passes from father to son and not from father to daughter.

Q: n Drosophila, one of the genes controlling wing length is located on the X chromosome. A recessive…

A: 1. Male with miniature wing, red  eye.     Female with Normal wing, red eye. 2. Phenotypes on…

Q: Researchers have identified a gene in humans that (when mutated) causes tremors and unstable walking…

A: DNA is the genetic material in most living organisms. It is the information hub of the cell that…

Q: In McCune-Albright syndrome, fibrous connective tissue replaces bone, tan patches (café-au-lait…

A: A mutation is considered a change in the DNA sequence, which can be either an addition or deletion…

Q: What is a heterochronic mutation? How does it affect the phenotypic outcome of an organism? What…

A: Mutation means sudden changes occur in DNA sequences. The mutation occurs randomly. It also occurs…

Q: “In an organism that reproduces asexually, there is no difference between a somatic cell mutation…

A: Somatic mutations These refers to the mutations in a single body cell, which cannot be inherited.…

Q: Name three possible factors contributing to early asymmetries in a developing embryo (i.e. what are…

A: FACTORS CONTRIBUTING TO EARLY ASYMMETRIES IN A DEVELOPING EMBRYO: Embryonic morphogenesis occurs…

Q: Several Drosophila species with unspotted wings are descended from a spotted ancestor. Would you…

A: Drosophila has a short, basic proliferation cycle. Organic product flies are little (3 mm long) yet…

Q: What is the underlying genetic defect that causes xeroderma pigmentosum?How can the symptoms of this…

A: Xeroderma pigmentosum condition is a result of specific mutations in the DNA and it is the autosomal…

Q: What is positional information? Discuss three different ways that cells obtain positional…

A: Drosophila is a commonly used model organism for studying developmental biology and genetics. The…

Q: heterozygous female and  a recessive male. From the offspring, backcross the recessive female with…

A: introduction  In mutagenesis evaluates for latent female sterile changes on the second chromosome of…

Q: In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal phenotype…

A: Genes are the basic units of heredity. The study of heredity is called Genetics. A gene has two…

Q: How do we know that human aneuploidy for each of the 22 autosomes occurs at conception, even though…

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Q: polydactyly is an abnormality characterized by webbing between partially or completely duplicated…

A: Given: Need to explain the  abnormality characterized by webbing between partially or completely…

Q: What is the most likely method by which a gene produces red eyes in fruit flies?

A: Answer is C.  Mutation changes the coding sequence of the genes so that it codes for red protein…

Q: drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal  phenotype…

A: Given  Recessive mutation = m-  Normal gene = m+  homozygous female(m-m-) egg can't support…

Q: In Drosophila subobscura, the presence of a recessive gene called grandchildless (gs) causes the…

A: The grandchildless is an autosomal recessive condition (gs/gs). The males of the Drosophila…

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A: Introduction Genetics is a branch of biology that studies genes, genetic diversity, and heredity in…

Q: What is FISH? Briefly describe how it works How is FISH used to characterize chromosomal…

A: FISH ( fluorescence in situ hybridization ) is a technique for detecting and locating a specific DNA…

Q: explain Position-effect variegation in Drosophila?

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Q: Gene A, which encodes alcohol dehydrogenase, is labeled with a red fluorophore in a FISH experiment…

A: Introduction :- FISH( fluorosecent in situ hybridization ) is a technique in which a DNA probe ,…

Q: The mutations called bobbed in Drosophila result from variable reductions (deletions) in the number…

A: Mutations known as bobbed results from varied deletions in the number of amplified rRNA coding…

Q: How would you devise a screen to identify recessive mutations in Drosophila that result in embryo…

A: Fruit flies, or Drosophila melanogaster, are a good model for studying genetics and were chosen by…

Q: In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormal  phenotype…

A: Alleles are the alternative forms of a gene, that can occupies the same locus of a homologous…

Q: A maternal effect gene in Drosophila, called torso, is found as a recessive allele that prevents the…

A: Introduction The relationship between two variants of a gene is referred to as dominant. Each parent…

Q: Brainbow is a genetic approach to fate mapping developed to label cells with a seeming rainbow of…

A: Brainbow is a genetic approach to fate mapping developed to label cells with a seeming rainbow of…

Q: In recent years, techniques have been developed to clone mammals through a process called nuclear…

A: In somatic nuclear transfer technology, the nucleus from a somatic cell is introduced into an…

Q: What would be the effect of deleting the toll gene in Drosophila embryos?

A: What are toll genes? Toll is a maternally required Drosophila gene that encodes a transmembrane…

Q: How is lozenge eye in drosophila an example of pseudoallelism?

A: Pseudoalleles are formed by duplication of a gene which further evolved to develop new functions.…

Q: What is positional information? What are three different ways that cells obtain positional…

A: Development is a continuous change in shape, size, and function, throughout the life of an organism.…

Q: Which Position-effect variegation in Drosophila?

A: Drosophila are known as the fruit flies that are importantly used as a model organism in the genomic…

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A: The genome of an organism is defined as the whole heredity information encoded in the genetic…

Q: Our understanding of maternal effect genes has been greatly aided by their identification in…

A: A maternal effect is a phenomenon where the nuclear genotype of a mother is expressed in the…

Q: In the lab, you discover two yeast haploid mutants that cannot produce arginine. You cross them…

A: The mutation causes a change in the DNA and it alters the type of protein that they codes and the…

Q: How did the discovery of three categories of petite mutations in yeast lead researchers to postulate…

A: Extranuclear inheritance is defined as the transmission of genes that happen outside the nucleus. It…

Q: What would you predict to be the phenotype of a Drosophila larva whose mother was homozygous for a…

A: Drosophila melanogaster is a common fruit fly. It is most common subject used in majority of genetic…

Q: How do the egl-1 and pos-1 phenotypes interact? Do you think this is a meaningful genetic…

A: Caenorhabditis elegans, a nematode is a useful genetic model to study RNA interference technique…

Q: As a volunteer in a genetics lab, Professor Uhura tasked you with testing the biparental…

A: Introduction: Drosophila melanogaster is a species of fly in the family Drosophilidae. The species…

Q: Explain the following

A: Gametogenesis is the method leading to the formation of the female and male germs cells. The…

Q: In the late 1980s, this gradient hypothesis was united with a genetic approach to the study of…

A: Introduction  During the developmental phase, cells have to move to form germ layers such as…