INTRODUCTION TO DROSOPHILA GENETICS DROSOPHILA CULTURE We will study basic principles of Mendelian inheritance with the use of the fruit fly‚ Drosophila melanogaster [the name means “black-bodied fruit-lover”]. Drosophila was one of the first organisms to be studied genetically: its small size‚ short life cycle (10 ~14 days at 25oC)‚ high reproductive rate (an adult female can lay 400-500 eggs in 10 days)‚ and ease of culture and genetic manipulation have made it perhaps the best understood animal
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Case Study – A Sickeningly Sweet Baby Boy Part I Questions 1. What additional information would you want to know to understand Emma and Jacob’s panic? To understand the cause of the panic that was brought to Jacob and Emma‚ you would need to know more about the state of the baby. This article just describes that the boy was having difficulty feeding‚ and after seven days he stopped feeding. This isn’t a situation that brings upon panic right away‚ but for Emma and Jacob it did. The panic
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In my lab experimentation‚ all of the parent generation‚ or flies I started with‚ were wild-type or mutant phenotypically‚ but their genotypes were unknown. However‚ after I mated these flies and they produced offspring‚ the parental genotypes could be hypothesized based on phenotypic observations and ratios of the F1 and F2 generations. I then could check my observations by testing it using the Chi squared (X2) test. A. Miniature Wings – (Sex-Linked Recessive) To determine the inheritance of
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observable characters that vary in pea plants are controlled by single genes. 2. A plant with purple flowers is allowed to self-pollinate. Generation after generation‚ it produces purple flowers. This is an example of a. hybridization. b. incomplete dominance. c. true-breeding. d. the law of segregation. e. polygenetics. 3. Which of the following statements about Mendel’s breeding experiments is correct? a. None of the parental (P) plants were true-breeding. b. All of the F2 progeny showed a phenotype
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MGIS 467 AIRBNB The hotel industry is a saturated industry that normally requires firms to maintain substantial overhead‚ substantial capital property‚ and brand reputation to successfully compete for fluctuating market shares. As a result‚ rivalry is high and there is little room for new entrants in the fiercely competitive and economically sensitive hotel industry. That being said‚ Airbnb has created a market that enables almost anyone who owns sleeping space to become a competitor to hotels
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Chapter 12 (Part 2) Explain the principle of independent assortment and its relation to meiosis: The segregation of chromosomes in anaphase I of meiosis explains Mendel’s observation that each parent gives one allele for each trait at random to each offspring‚ regardless of whether the allele is expressed. The segregation of chromosomes at random during anaphase I explains Mendel’s observation that factors‚ or genes‚ for different traits are inherited independently of each other. Apply the
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incomplete dominance. E) hemizygosity. 5) Assume that a cross is made between AaBb and aabb plants and that the offspring occur in the following numbers: 106 AaBb‚ 48 Aabb‚ 52 aaBb‚ 94 aabb. These results are consistent with the following circumstance: A) sex-linked inheritance with 30% crossing over. B) linkage with 50% crossing over. C) linkage with approximately 33 map units between the two gene loci. D) independent assortment. E) 100% recombination. 6) With incomplete dominance‚ a likely
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Chapter 9: Patterns of Inheritance What pattern will inheritance follow? Why is it important? Always follow patterns? Rule of Probability In tossing a coin the odds of either a head or tail is always 50%. The outcome is unaffected by the previous attempt. If 2 coins are tossed‚ each will be dependent of the other HH‚ HT‚ TH‚ TT (Probability is 25% or ¼) The rules also hold true for genetics due to the law of independent assortment. Each alternative type of outcome in a gene acts independently
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offspring are roan‚ a shade between red and white. This is an example of genes that are _____. a. Nonhomologous b. Codominant c. Incompletely dominant d. Epistatic e. Completely dominant 6. Flower color in snapdragons is an example of incomplete dominance. If a red-flowered plant is crossed with a white-flowered plant‚ the F1 generation has pink flowers. If a pink-flowered plant is crossed with a pink-flowered plant‚ the progeny plants will be __________. a. 50% pink and 50% red b. 25% red‚ 50% pink
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GENETICS JARGON Alleles (allelomorphs) Alternative forms of a particular gene. There can be several alleles of a particular gene in the population‚ but only 2 alleles can be inherited by a single individual. For simplicity much literature aimed at the general reader uses "gene" where it means "allele". Allelic Series A series of alleles that are all mutant forms of the same gene and are at the same locus (same position on the chromsome). Alternate Heredity Mendelian inheritance involving
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