Propose a hypothesis that could explain the following observation. A graduate student performing studies on mutations in drosophila (fruit flies) discovered a strain of flies with a silent mutation in the gene controlling the shape of the wings. Further investigation has shown that this mutation is lethal in flies who are homozygote. Flies that are homozygote wild type or heterozygote can develop and are able to survive
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Propose a hypothesis that could explain the following observation.
A graduate student performing studies on mutations in drosophila (fruit flies) discovered a strain of flies with a silent mutation in the gene controlling the shape of the wings. Further investigation has shown that this mutation is lethal in flies who are homozygote. Flies that are homozygote wild type or heterozygote can develop and are able to survive.
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- Using this information, how do I figure out the answer to question1? INTRODUCTION In most species of Drosophila, a female mating with a single male usually supplies sufficient sperm to fertilize her lifetime supply of eggs. Moreover, mating is often costly to female flies. So why do females of some species mate more than once? Perhaps they do this to assess the quality of males and/or the sperm males produce via sperm competition. Tom Price, Nina Wedell, and their colleagues at the University of Exeter provide evidence for the sperm competition hypothesis. They show multiple mating increases in frequency when a selfish genetic element that reduces sperm quality is prevalent. In Drosophila, females are XX and males are XY. They normally occur in equal numbers. In D. pseudoobscura, males that harbor the X-linked selfish genetic element sex ratio (SR) have produced nearly all female progeny, as SR sabotages Y-bearing sperm. The SR element gains a tremendous transmission advantage but…Assume you are studying development in two species of iguana. You determine that a certain gene, "SPN2" turns on and off at different times in the two different species. The difference in timing leads to a different body length between the two iguana species. This phenomenon is an example of which of the following terms? a. Punctuated Equilibrium b. Pleiotropy c. Gene duplication d. HeterochronyIllustrate the relationship of the gene for the eye color to the segregation of chromosomes of Drosophila.
- There is a gene in the fruit fly (Drosophila) called antennepedia. It controls the formation of which structures? What happens when it isRead the following passage carefully about some aspects of genetics involving a certain species of Drosophila and then answer the following questions in parts The gene for the production of eye colour in this species of fruit fly can be expressed as either normal red-eyes or as brown-eyes. The allele for the normal red eyes is dominant to that of brown, and is transmitted in normal Mendelian fashion. A gene involved with body colour in this species of fruit fly is located on the non-homologous portion of the X chromosome, and has two alleles, grey and yellow, where the grey allele is dominant to yellow. The two genes are NOT linked. a) Produce a key to clearly show the nature of the alleles associated with the eye colour in this species of Drosophila, and in each case justify your choice of letters and / or style of presentation to best depict the genetics involved. b) State the type of genetics involved in terms of body colour, justifying your answer with the evidence from…in a summary use your understanding of molecular biology to explain that recessive alleles are expressed through transcription and translation, and that they may have functional gene products. Describe how the interaction of the products produced by each allele results in what we see as dominant or recessive traits.
- 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.Lou, a researcher, is examining two different fireflies, and each firefly is homozygous for a mutation that is inherited in an autosomal recessive manner. Lou has discovered that the two fireflies both show defects in flying. Lou would like to determine if both fireflies have mutations in the same or different genes, so he mates the two fireflies together. The resulting offspring all can fly normally. What would this result suggest? Select all that apply. Group of answer choices A) The two parent fireflies contain mutations in different genes B) The two parent fireflies contain mutations in the same gene C) This is an example of complementation D) This is an example of the failure to complementWhat changes, if any, would you predict would occur in the pigmentation of Drosophila melanogaster with increased global warming? What type of genetic changes would you expect to see? Be as specific as you can.
- What is one statement that would support the theory that all organisms are related? A) The genetic code is almost universal.B) All flies have 2 wings.C) Eukaryotes have mitochondria.D) Prokaryotes have circular chromosomes.E) That the Theory of Pangenesis has held up to scrutiny for thousands of years What is the difference between cross and self-fertilization? A. In cross-fertilization the gametes from one plant are used to fertilize the gametes of another plantB. In cross-fertilization the gametes from one plant are used to fertilize the gametes from the same plant C. In self-fertilization the gametes from one plant are used to fertilize the gametes from another plantD. In cross-fertilization insects are used to pollinate the plants while in self-fertilization the investigator pollinates the plantsAn experiment is conducted on the eggs of purple-feathered barn swallows. A clutch of eggs from this nest is separated into two halves. One half of the eggs are left with the purple-feathered parents, and the other half of the eggs are moved to a nest built by gray-feathered barn swallows. Genetic analysis has shown that barn swallows have genes coding for feather color. Upon maturity, all barn swallows left with the original parents have purple feathers, while those that were transplanted have gray feathers. This experiment is repeated with a large number of other nests with similar results. What explains the results of this experiment? A:Color in barn swallows appears to follow a pattern of codominance. B:Genes in the transplant parents appear to influence feather color in barn swallows. C:Genes appear to have no influence on color pattern in barn swallows. D:Color in barn swallows appears to be influenced by both genes and the environment.According to the Lyon hypothesis,a. one of the X chromosomes is converted to a Barr body insomatic cells of female mammals.b. one of the X chromosomes is converted to a Barr body in allcells of female mammals.c. both of the X chromosomes are converted to Barr bodies insomatic cells of female mammals.d. both of the X chromosomes are converted to Barr bodies inall cells of female mammals.