The following questions are based on the StarGenetics \"Fruit Fly Tutorial 1\" e
ID: 187906 • Letter: T
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The following questions are based on the StarGenetics "Fruit Fly Tutorial 1" exercise, "Fruit Fly Exercise 1 Level 1", and "Fruit Fly Exercise 1 Level 2": 7. Using StarGenetics exercises to practice Mendelian Genetics with, Peter has identified in the tutorial exercise that a gray body colored mutant fly is due to an X-linked mutation, and the gray body color is a recessive phenotype, which option below illustrates the proper way to write out the genotype of such gray color mutant male fly when the symbol "G" illustrate the wild type allele, "g" mutant allele? A. Gg D. X Y Continued from question 7, when a female fly that has gray body color mates with a male fly with wild type body color, Peter would see the offspring 8. A. All offspring showed wild type body color All offspring showed gray body color B. All female offspring show wild type body color, and all male fly show gray body color D. All male offspring show wild type body color, and all female fly show gray body color 9. What would be the best explanation to explain the first mating result that Peter got (see the figure below) when he did "Fruit Fly Exercise 1 Level 1", in which wild type male fly is a true line (aka true breeding line) Phenotype description Show Phenotypes TOTAL 1000 499 501 Mating site Count Female Male 475 (48%) 239 236 525 (53%) 260 265 grounded Wildtype M The grounded mutant phenotype is recessive The grounded mutant phenotype is dominant, and the female parent fly is homozygous for the mutated gene The grounded mutant phenotype is dominant, and the female parent fly is heterozygous for the mutated gene A. B. C.Explanation / Answer
1) XgY - Since gray body color is an X linked mutation and is recessive in inheritance, the mutant fly should have two recessive alleles in case of female and one recessive allele is sufficient to cause disease in a male. Hence, out of the available options XgY will be the genotype of the gray body colored mutant fly.
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