4. You are starting a research program in a Drosophila lab, A previous students

Question

4. You are starting a research program in a Drosophila lab, A previous students did a mutagenesis project and have extra legs, and you are interested in the genetics of this strain (named "millipede") His flasks of this strain are all labeled "millipede intercross", and he consistently uses the left behind his strains, but his lab notebook is written in Sanskrit. He has a strain of flies that 4a. Assuming he used normal Drosophila nomenclature, what phe recessive in this cross? notypes do you think are dominant and 4b. Both millipede and wild type flies of both sexes appear in his flasks. You want to perform test crosses to determine if your model above is correct. What flies will you c genotype and phenotype of the tester strain? ross, and what will be the 4c. How can you use the data from your test crosses to determine whether the millipede gene is on the X-chromosome or an autoome? Be specitfie btchdata would support whieh

Explanation / Answer

4) a) The presence of millipede phenotype is dominant and wild type is recessive.

b) Test cross is done to determine the genotype of unknown offspring. The tester strain will be homozygous recessive. If the genotype of unknown offspring is homozygous, all the offsprings will be having millipede phenotype. If the genotype of unknown organism is heterozygous, half if the offsprings will be having millipede phenotype and the other half will be having wild phenotype.

c) If the millipede gene is on X chromosome, there will be sex specific differentiation in the distribution of phenotypes. On the other hand, if the millipede gene is on autosome, there will be no sex specific differentiation in the distribution of phenotypes.

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