If a fertilized Drosophila egg is punctured at the anterior end and a small amount of cytoplasm is allowed to leak out, what will be the most likely effect on the development of the fly embryo?

Give examples of genes that affect development in fruit flies by regulating gene expression at the level of (a) transcription and (b) translation.

A liver cell in a crocodile contains 32 chromosomes. Which of the following correctly shows the haploid cell in a crocodile and the number of chromosomes expected to be found in a haploid cell? A B C D sperm cell, 32 chromosomes brain cell, 16 chromosomes egg cell, 16 chromosomes muscle cell, 32 chromosomes

An embryologist measures the concentrations of three morphogens (A, B, C) in a row of cells across an embryo, from anterior to posterior. The morphogens cause the expression of various colored pigments as indicated in the graphs. Anterior Posterior Expression of Blue protein only [A] Expression of Red protein only Expression of Green protein only Anterior Posterior [B] Repression of Purple protein Activation of Red protein Anterior Posterior [C] Activation of Yellow protein Which shows the correct expression of pigments expressed in response to Morphogen A? Anterior Posterior Anterior Posterior Anterior Posterior Anterior Posterior

Plant breeders use colchicine to A) prevents cytokinesis in somatic cells B) increase the occurrence of unequal crossing over events during meosis C) stop the segregation of homologous chromosomes during meiosis D)  triggers the production of haploid gametes and diploid organism

What will be the effect on sexual development in newly fertilized Drosophila embryos if the following genes are deleted? Q. transformer

You inject bicoid MRNA into the posterior end of a fertilized fruit fly egg just prior to the first cleavage. How will the experiment affect Hox gene expression in this fly? How will it affect the fly embryo's anatomy? Explain your answer, demonstrating your understanding of the role bicoid and Hox genes play in development.

Explain the wingless and hedgehog feedback mechanism that is used to pattern the fly embryo.

A classical experiment studying the fate determination of stem cells in the developing embryo uses the transplantation of somites from one organism to another. In such an experiment, a scientist transplanted somites 20, 21, and 22 from the right side of the neural tube from five-day-old developing quail embryos into chick embryos. The transplantation was performed in two orientations so that the order of the somites was sometimes reversed.   Use the passage to answer the question. Observations of the developing chick embryo reveal that skeletal muscles develop from the transplanted somites even though motor neurons innervating those muscles arise from chick neural crest cells. Based on these observations, what is MOST likely true?   A. Neural crest cells differentiate into somites.   B. Neural crest cells fuse with developing somite cells.   C. Neural crest cells develop from migrating somite cells.   D. Neural crest cells send projections into developing…

Explain the Drosphila melanogaster tool for gene expression known as UAS-GAL4 system.