If a Drosophila larva is missing much of its posterior end it is likely due to a mutation che: A. maternal bicoid gene. B. zygotic bicoid gene. C. maternal nanos gene. D. zygotic nanos gene.
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- Molecular geneticists have performed experiments in which they altered the number of copies of the bicoid gene in flies, affecting the amount of Bicoid protein produced. a. What would be the effect on development of an increased number of copies of the bicoid gene? b. What would be the effect of a decreased number of copies of bicoid? Justify your answers.There is a gene in the fruit fly (Drosophila) called antennepedia. It controls the formation of which structures? What happens when it isA drug causes the degradation of Cactus protein. What would be the effect of administering this drug to developing Drosophila embryos?
- If you observed fruit flies with the following developmental abnormalities, would you guess that a mutation has occurred in a segmentation gene or a homeotic gene? Explain your guess. A. Three abdominal segments were missing. B. One abdominal segment had legs. C. A fly with the correct number of segments had two additional thoracic segments and two fewer abdominal segments.What is the difference between a maternal-effect gene and a zygotic gene? Of the following genes that play a role in Drosophila development, which are maternal-effect genes and which are zygotic? Explain your answer. A. nanos B. Antp C. bicoid D. labUsually, the mutant alleles studied in Drosophila experiments are recessive because: A. they are difficult to create. B. they are loss of function mutations. C. they do not survive as long as dominant alleles. D. they do not occur in wild-type flies.
- The toolkit genes generally regulate_____ [A]_____ in order to direct development. Other developmental decisions are regulated _____[B]_____, as we saw in sex determination in flies. *Hint: these are steps in the Central Dogma? Give typing answer with explanation and conclusionIf 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?Which statement about Hox genes is false? a. They are expressed in similar patterns in the embryos of both mice and flies. b. They include a conserved region of base pairs called the homeobox. c. They are arranged in similar clusters of genes in both mice and flies. d. They are part of the so-called genetic toolkit. e. Because of their important functional roles, they evolved rapidly in both mammals and flies.
- Compare and contrast how maternal-effect genes, gap genes, and homeotic genes affect Drosophila development.Fruit fly segmentation begins during oogenesis and is affected by which maternal genes? (Note answers can be multiple or if not given from the option, provided the proper answer) a. Gap genes b. Oskar genes c. Pair-rule genes d. Gurken genesDoes this statement is a example of a phenocopy? Explain your reasoning. Q. Vestigial wings in Drosophila are produced by a recessive mutation. This trait is also produced by high temperature during development