Q: Where are Drosophila melanogaster found?
A: Drosophila belongs to the family Drosophilidae, whose members are commonly called as small fruit…
Q: When an embryo is homozygous mutant for the gap gene Kr, the fourth and fifth stripes of the…
A: Segmentation in the Drosophila embryo is regulated by pair-rule genes and gap genes.
Q: Explain how the mouse and the fruit fly differ in the chromosomal control of sex determination.
A: Sex determination is a biological system by which the development of the sexual characteristics in…
Q: Which of the following conditions are required for the Eve protein to be expressed in the cells that…
A: Apoptosis is defined as a form or type of programmed cell death that will occur in multicellular…
Q: A classical experiment studying the fate determination of stem cells in the developing embryo uses…
A: Answer :- Option ( D) is correct. - The organs arising from quail somites develop in the reverse…
Q: Describe the formation steps of the primary axis that first occurs during development in Drosophila…
A: Embryos produce different types of cells and functional tissues and organs are formed by these cells…
Q: Transmission of information from cells to cell or from parent to progeny that is not encoded in DNA.…
A: Inheritance is the process of transfer of information from parents to offspring via the genetic…
Q: why Inversion loops form in inversionheterozygotes
A: Chromosome contains DNA which is a genetic material of an organism. The inversion is a condition in…
Q: Describe the cascade of RNA splicing events initiatedby the Sxl protein that results in female…
A: In drosophila, the pre-mRNA undergoes sex-specific splicing to control sex determination. The…
Q: The direction of shell coiling in the snail Lymnaea peregra (discussed in the introduction to this…
A: Conchology deals with the study of formation and patterns of conch and shells. Its a part of…
Q: Engrailed, even-skipped, hunchback, and Antennapedia.To a Drosophila geneticist, what are they? How…
A: Drosophila represents the genus that includes flies that belong to the Drosophilidae family. The…
Q: Describe with diagram the synaptonemal complex
A: As we know all living organisms are made of basic unit of structure and function called as cell. To…
Q: The direction of shell coiling in the snail Lymnaea peregra (discussed in the introduction to this…
A: Conchology deals with the study of formation and patterns of conch and shells. Its a part of…
Q: Do you think cadherins or integrins are responsible for the dependence of mammary cells on the…
A: Mammary stem cells are the adult stem cells in the mammary gland and are multipotent(differentiate…
Q: You cause a mutation in the bicoid gene in a Drosophila embryo. What effect will this have on this…
A: The members of Drosophila are called "fruit flies." Drosophila embryogenesis is the process by which…
Q: The direction of shell coiling in the snail Lymnaea peregra (discussed in the introduction to this…
A: Among the given option, option (b) is the least appropriate or not correct.It is because a single S+…
Q: What will be the effect on sexual development in newly fertilized Drosophila embryos if the…
A: Sex determination in drosophila melanogaster is done by balancing the male determinants on the…
Q: The inheritance in short wings in Drosophila fruit flies is an x-linked trait, recessive. Which…
A: X-linked recessive inheritance is caused when a mutation occurs in the X-chromosome therefore a male…
Q: In drosophila embryos that are null mutants for hedgehog (hh'/hh), expression of which of the…
A: In drosophila, segment polarity genes are those genes which act to specify the correct pattern of…
Q: A Drosophila embryo dies during early embryogenesis due to arecessive maternal effect allele called…
A: The kind of inheritance in which, the characters do not separate according to the laws of Mendel is…
Q: What will be the effect on sexual development in newly fertilized Drosophila embryos if the…
A: In Drosophila, sex determination is achieved by a balance of female determinants on the X chromosome…
Q: Outline the molecular mechanism of sex determination in Drosophila and mammals.
A: Sex determination refers to determining the sex of an individual. The sex of an organism is…
Q: sex determenination.
A: In humans males are heterogametic and females are homogametic. heterogametic means production of…
Q: The direction of shell coiling in the snail Lymnaea peregra (discussed in the introduction to this…
A: Two strains of Limnaea peregra or water snail are there that differ each other in the direction of…
Q: Events that leads to the production of Siamese/conjoined tw
A: Identical twins are formed when zygote formed initially splits into two cells and these two cells…
Q: Each of the vertebrate Hox genes is present in 4 copies of the genome (TRUE or FALSE)
A: A transcription factor is the protein product of each Hox gene. The homeobox, of which the name…
Q: >chromosomal…
A: Codons are trinucleotide sequence that codes for specific amino acids and there are totals of 64…
Q: What will be the effect on sexual development in newly fertilized Drosophila embryos if the…
A: In Drosophila, sex determination is achieved by a balance of female determinants on the X chromosome…
Q: True or false: A somatic cell mutation may be passed on to offspring
A: Somatic cells and germ cells are the two types of cells found in the body. Mutations in any of the…
Q: The direction of shell coiling in the snail Lymnaea peregra (discussed in the introduction to this…
A: The undeveloped organism is framed when a female gamete joins with a male gamete. In by far most of…
Q: Which plane would be helpful when viewing the heart and the right kidney at the same time? whychose…
A: INTRODUCTION Fertilization Fertilization is a process of union of the spermatozoa and oocyst and…
Q: True or false If epigenetic marks were irreversible, it would be impossible to clone an animal from…
A: The epigenome of a cell is the complete collection of epigenetic marks such as DNA methylation ,…
Q: How does sex determination in Drosophila differ from sex determination in humans?
A: Sex determination is a method for determining the sexual characteristics within an organism. These…
Q: Describe the expression pattern of the Drosophila geneeve in the early embryo.
A: Drosophila development involves the specification of early embryonic cells by various cytoplasmic…
Q: Genetic maternal effect is often seen in mammals. For example, research shows that the maternal…
A: In genetics, a maternal effect occurs when a mother's genotype is expressed in the phenotype of her…
Q: Illustrate the chromosomes in the salivary gland of Drosophila melanogaster
A: Drosophila melanogaster have polytene chromosome in their salivary gland.
Q: The corpus luteum (CL) is critical in the maintenance of pregnancy in the mouse. Explain why? What…
A: The function of reproduction is to confirm a species' survival; it is the process through which…
Q: Transmission of information from cells to cell or from parent to progeny that is not encoded in DNA.…
A: The DNA or deoxyribonucleic acid contain the genetic information that is transmitted from parents to…
Q: What is the difference between sex determination in mammals and in Drosophila?
A: Sex determination is the process of identification of different sex that is male and female, in…
Q: A classical experiment studying the fate determination of stem cells in the developing embryo uses…
A: Introduction Muscles are a type of soft tissue. muscles are made up of a lot of flexible fibres.
Q: Describe the major difference between sex determination in Drosophila and in humans.
A: Drosophila melanogaster refers to the fruit fly which is widely used in genetic research as it has…
Q: The direction of shell coiling in the snail Lymnaea peregra (discussed in the introduction to this…
A: The given statement that Martha's genotype cannot be s+s+ is false.
Q: The anterior–posterior axis of a Drosophila embryo is first established by certain (a) homeotic…
A: Drosophila is an important organism in developmental genetics research because it has a short life…
Q: As we have focused on sex differentiation, sex chromosomes, and genetic mechanisms involved in sex…
A: There are two sex chromosomes, chromosome X and chromosome Y. The combination of these chromosomes…
Q: List the stages of Drosophila development.
A: Drosophila is a fly that belongs class insecta and order diptera of Animal kingdom. It is commonly…
Q: With relevance to sex determination in humans, discuss: i) X chromosome inactivation; and ii)…
A: In humans, sex is determined by sex chromosomes( XX females xy males). the X and y chromosome harbor…
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Solved in 2 steps
- Describe the expression pattern of the Drosophila geneeve in the early embryo.Nanos is a strict maternal-effect gene in Drosophila; that is not transcribed in the embryo. Mutations in nanos result in the loss of posterior structures in the embryo. Predict the phenotype (i.e. wild type or mutant) of the following embryos.“In the early Drosophila embryo, the establishment of different body regionor tissues along, on the one hand, the anteroposterior axis and, on theother, the dorsoventral axis are initiated by clues provided by the egg’smother; however the nature of those signals and the way in which theyoperate is completely different”. Discuss whether this statement is correct.
- Polarity of oocyte of DrosophilaWhat is the difference between the anterior and posterior determinant for the oocyte?Discuss how the anterior portion of the anteroposterior axis is established in Drosophila. What aspects of oogenesis are critical in establishing this axis? What do you think would happen if the bicoid mRNA was not trapped at the anterior end but instead diffused freely throughout the oocyte?Which of the following applies to the female sex determination in Drosophila melanogaster fruit flies? (Mark all that apply) When the X:A ratio is 1.0, the SXL gene is transcribed during the early embryonic stages. The SXL protein inhibits the expression of female differentiaion genes The SXL protein promotes the correct splicing of the Tra pre-mRNA so that functional Tra protein is made. The presence of the SXL protein promotes the correct splicing of the SXL pre-mRNA during later embryonic stages to ensure to continuous production of SXL protein. The Tra protein will stimulate the expression of male-specific genes.
- Describe the formation steps of the primary axis that first occurs during development in Drosophila by explaining each molecule.EXTRANUCLEAR INHERITANCE In drosophila, a recessive mutation (m-) of a maternal effect gene (MEG) results in an abnormal phenotype wherein homozygous (m-m-) females produce eggs that cannot support embryonic development. Homozygous (m-m-) males, however, can still produce viable sperm. Using m+ to denote a normal gene, determine the genotypes and phenotypes of the F1s produced by a cross between a heterozygous female and a recessive male. From the offspring, backcross the recessive female with the paternal strain. What are the genotypes and phenotypes of the F2s? with COMPLETE cross for both cases.What would be the most likely effect on development of puncturing the posterior end of a Drosophila egg, allowing a small amount of cytoplasm to leak out, and then injecting that cytoplasm into the anterior end of another egg?
- What would be the most likely effect of inhibiting the translation of hunchback mRNA throughout a Drosophila embryo?Expression of a homeotic gene in the wrong tissue in Drosophila results in the development of an inappropriate body part from that tissue. Explain why this happens and how it shows that homeotic genes are positive regulators of developmental pathways.In drosophila, a recessive mutation (m-) of a maternal effect gene results in an abnormalphenotype wherein homozygous (m-m-) females produce eggs that cannot support embryonicdevelopment. Homozygous (m-m-) males, however, can still produce viable sperm. Using m+ todenote a normal gene, determine the genotypes and phenotypes of the F1s produce by a crossbetween a heterozygous female and a recessive male. From the offspring, backcross the recessivefemale with the paternal strain. What are the genotypes and phenotypes of the F2s?