The anterior–posterior axis of a Drosophila embryo is first established by certain (a) homeotic genes (b) maternal effect genes (c) segmentation genes (d) proto-oncogenes (e) pair–rule genes

Q: Compare and contrast how maternal-effect genes, gap genes, and homeotic genes affect Drosophila…

A: Homeotic genes are the class of genes present in Drosophila that direct the development of the…

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: 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: Describe key events in early Drosophila developmentthat occur before segmentation is first apparent.

A: The life cycle of drosophila consists of various stages like embryogenesis, larval stage, pupal…

Q: You are interested in the expression of regions of the X chromosome at different times in human…

A: The investigation of the X chromosome at different phases of human fetal development is a complex…

Q: Discuss the role of homeotic genes in development. Explain what happens to the phenotype of a fruit…

A: The homeotic genes are the group of genes that regulate the formation of the anatomical structures…

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: Compare and contrast the experimental advantages and disadvantages of Drosophila, C. elegans,…

A: Model organisms are non-human species that are used to conduct experiments in the laboratories as…

Q: 64.  Embryonic stem (ES) cells differ from somatic stem cells in that ...   a)  ES cells can only…

A: Embryonic stem cells can be derived fron embryonic tissues while adult stem cells from adult somatic…

Q: Cleavage divides the eggs of vertebrates and many other animals into a cluster of separate cells. By…

A: An embryo in development is an excellent example of intricate biological self-organization and…

Q: You discover a new Drosophila mutant in which mouthparts are located where the antennae are normally…

A: In Drosophila there are large genes which help in formation of body parts and forming body axis .

Q: Describe the relationship between homeotic genes in Drosophila and in mice.

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

Q: Two normal-looking fruit flies were crossed and, in their progeny, there were 202 females and 98…

A: •The proportion 202 and 98 of females to male fruit fly progeny is compatible with the ratio 2 : 1.…

Q: What changes, if any, would you predict would occur in the pigmentation of Drosophila melanogaster…

A: The relatively simple morphological trait that helps in the mapping of the genetic basis of…

Q: The phenotype of a heterozygous mouse (Aa) is agouti.  The agouti banding pattern is due to altered…

A: * Homozygous dominant and Heterozygous will produce agouti that is AA or Aa respectively  and the…

Q: What complications might arise from genetic screens targeting an organ that differentiates late in…

A: The eye has been one of the most intensively studied organs in Drosophila. The wealth of knowledge…

Q: Which of the following illustrates the regulative nature of early mouse development? (a) the mouse…

A: The mouse has been used as a model organism to study the development of mammals.

Q: Removing the patch of tissue called the ZPA from one limb bud and placing into onto another…

A: ZPA is a zone of polarising activity, gives molecular signaling during limb formation in…

Q: Explain how loss-of-function mutations in the following categories of genes would affect the…

A: Drosophila is also called fruit-fly. It is often used as a model for biological investigations.

Q: Give examples of genes that affect development in fruit flies by regulating gene expression at the…

A: Gene is a functional unit of heredity. A gene is a sequence of nucleotides in genome that codes for…

Q: explain Position-effect variegation in Drosophila?

A: Mutation is defined as the permanent change or alterations happening in the sequence of the DNA of…

Q: What are the relative merits of Drosophila, C. elegans, M. musculus, and Arabidopsis as model…

A: Model organisms are employed in research experiments to study a specific phenomenon where the…

Q: The BMP-Nodal gradient so vital to amphibian and fish development may be critically important in…

A: Pluripotent stem cells: Pluripotent stem cells are defined as the ability of the cells to self renew…

Q: An inherited disorder caused by a defective or absent enzyme is called (a) a karyotype (b) trisomy…

A: Introduction:- Inherited metabolic diseases are a group of medical problems caused by genetic flaws…

Q: Which of the following is NOT true regarding Hox genes.     A) The sequence they appear in their…

A: Hox genes: Hox genes are a group of similar genes that define parts of an embryo's structure along…

Q: You inject bicoid MRNA into the posterior end of a fertilized fruit fly egg just prior to the first…

A: Drosophila refers to the genus of flies that is commonly called fruit flies. It is a small fly seen…

Q: Runt is a Drosophila gene involved in development. Mutation of runt leads to an embryonic lethal…

A: There are three important class of segmentation genes namely - gap genes, segment polarity genes and…