3. In Drosophila, sepia eyes are caused by a recessive mutation. Suppose that you find that 16 % of the flies in a population have sepia eyes. a. What is the frequency of the dominant allele? b. What must you assume to solve this problem?
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3. In Drosophila, sepia eyes are caused by a recessive mutation. Suppose that you find that 16 % of the flies in a population have sepia eyes.
a. What is the frequency of the dominant allele?
b. What must you assume to solve this problem?
Step by step
Solved in 2 steps
- 1. What are the expected proportions in the offspring? You will need to propose which trait is dominant, either the wild-type or the mutant? 2. Using the chi square calculator to analyze your results. Provide a summary that includes whether you support or reject the hypothesis.6. Read the following sentence: “Even though people selectively breed to yield animals with desired traits, there are dangers to selective breeding.” What does yield mean as used in the text? a) To produce b) To surrender c) To endanger d) Not worth much money to remove4. If the short-haired cat in the P-Generation were purebred, what would be the genotype for the offspring? What is the ration for EACH phenotype? Use the picture below to answer.
- 2.In dogs, there is a hereditary deafness caused by a recessive allele, d. A kennel owner has a male dog that she wants to use for breeding purposes if possible. The dog can hear, but the owner is unsure of the genotype. She does a testcross (crosses it to a homozygous recessive dog), and two of the five offspring are deaf. This means that the male dog A.has the genotype DD B.has the genotype Dd C.is still of unknown genotype since there were offspring of both deaf and hearing phenotypes. D.has the genotype dd1. The frequency of a recessive disease is 9%. What is the frequency of the allele that causes s the disease? a) What is the frequency of the dominant allele? b) What is the frequency of the carriers (heterozygotes) of the disease?2) In some Drosophila species, conditions in the female reproductive tract do not allow the sperm of other species to survive long enough for fertilization to occur. What mechanism of reproductive isolation is in operation in this example? a.Temporal isolation. b.Mechanical isolation. c.Low hybrid viability. d.Gametic isolation.
- 5. Why is it possible for a trait that is not present in the present generation to appear in the next generation? Explain briefly.4. When the F1 bees were backcrossed to the inbred resistant line produced 4 types of offspring in equal numbers: ¼ if the back-cross offspring showed the complete hygienic behavior pattern¼ of the back-cross offspring showed none of the elements of hygienic behavior¼ of the back-cross offspring would uncap the cells of the diseased larvae but these workers would not remove the diseased larvae¼ of the back-cross offspring would remove the diseased larvae (once the experimenter had uncapped the cells of the diseased larvae) a. If the resistant behavioral pattern is due to two gene loci with two alleles each, can this account for the 4 phenotypes shown in the back-cross? How? b. If you use UURR (for the non-resistant inbred line) and uurr (for the resistant inbred line), what are the phenotypic and genotypic ratios for the F2 cross between these lines (i.e., F1 x F1)? Show your work: c. Given the genetic model given in part d, do the backcross offspring in part c (from an F1 x resistant…1A. Fruit Flies and Genetics Research: Imagine you are working in a genetics lab with the fruit fly Drosophila melanogaster, a model organism for genetics research. You want to determine whether a trait you have discovered in fruit flies is dominant or recessive.• Explain how you would design an experiment to answer this question.• Predict what types of outcomes are possible. Which would indicate that the trait is dominant? Which would indicate that it is recessive? 1.B Model Genetic Organisms: Why are fruit flies considered a model genetic organism? Would humans fit this description?
- 1. Describe what you think would happen if a male mouse acquired a mutation that gave it tan or a sandy colored belly AND female mice wanted to mate with this more about 1 % more than a male mouse with a white belly? 2. Now, suppose that the females were really wild about the sandy colored belly of this male mouse. The females wanted to mate with this lucky mouse about 10% more than males with a white belly? What would happen to the frequency of sandy colored bellies in this population over time? 3. What is the selective pressure at work in questions 1 & 3? 4. Describe what this statement means: "The division of humans into races by using skin color is an arbitrary social construct." 5. What are melanosomes? Name the cell type that produces melanosomes. 6. What happens to melanosomes after they are released into keratinocytes? 7. List the three factors that work together to create the range of skin colors we see today. 8. Describe the main function of keratinocytes and of…Imagine you are trying to test whether a population of flowers is undergoing evolution. You suspect there is selection pressure on the color of the flower: bees seem to cluster around the red flowers more often than the blue flowers. In a separate experiment, you discover blue flower color is dominant to red flower color. In a field, you count 600 blue flowers and 200 red flowers. What would you expect the genetic structure of the flowers to be?1. A new species of animal called the rekamriliob has been found in the wild. The lab you work in has been tasked with studying its genetics. So far, there have been 2 main phenotypes found in the wild. Through selective breeding, your lab has determined that the gene for purple color (P) is dominant to the gene for golden color (p). Another lab has determined that the thick limb trait is dominant to the thin limb variety. If you breed a purebred purple thick limbed rekamreliob male with a golden thin limbed female, you get 100% thick limed offspring that are purple in color. If you take two of these organisms and breed them together, please predict the following. Assume that rekameliobs lay an average of 32 eggs. The gametes produced if the genes are unlinked b. genes The expected numbers of the possible phenotype in the offspring with unlinked The gametes produced if the genes are linked (list all possibilities, and show which ones are the result of crossing over) d. List the…
