Drosophila melanogaster,the fruit fly,has a 2n chromosome number of 8.Assume that you are microscopically examining the mitotic and meiotic cells of this organism.You note that in the female,two chromosomal pairs are metacentric and that two pairs are acrocentric.
a) Draw the chromosomal configurations as you would expect to see them at the stages listed:
Mitotic metaphase
First polar body (metaphase)
Primary oocyte (metaphase)
Ootid (G1)
Secondary oocyte (metaphase)
b) Given that the above-mentioned cells are from individuals heterozygous for two independently segregating,autosomal loci,plum eyes and curled wings,place appropriate symbols (of your designation)on chromosomes in the drawings you made in part (A)above.Assume no crossing over,and there may be more than one correct answer in some cases.
c) Assuming that a somatic G2 nucleus from one of the individuals in this scenario contains about 8.0 picograms of DNA,how much nuclear DNA would you expect in each of the cells mentioned above?

Question

Drosophila melanogaster,the fruit fly,has a 2n chromosome number of 8.Assume that you are microscopically examining the mitotic and meiotic cells of this organism.You note that in the female,two chromosomal pairs are metacentric and that two pairs are acrocentric.
a) Draw the chromosomal configurations as you would expect to see them at the stages listed:
Mitotic metaphase
 First polar body (metaphase)
Primary oocyte (metaphase)
 Ootid (G1)
Secondary oocyte (metaphase)
b) Given that the above-mentioned cells are from individuals heterozygous for two independently segregating,autosomal loci,plum eyes and curled wings,place appropriate symbols (of your designation)on chromosomes in the drawings you made in part (A)above.Assume no crossing over,and there may be more than one correct answer in some cases.
c) Assuming that a somatic G2 nucleus from one of the individuals in this scenario contains about 8.0 picograms of DNA,how much nuclear DNA would you expect in each of the cells mentioned above?

Quizplus · Accepted Answer

The Answer of Drosophila melanogaster,the fruit fly,has a 2n chromosome number of 8.Assume that you are microscopically examining the mitotic and meiotic cells of this organism.You note that in the female,two chromosomal pairs are metacentric and that two pairs are acrocentric.
a) Draw the chromosomal configurations as you would expect to see them at the stages listed:
Mitotic metaphase
 First polar body (metaphase)
Primary oocyte (metaphase)
 Ootid (G1)
Secondary oocyte (metaphase)
b) Given that the above-mentioned cells are from individuals heterozygous for two independently segregating,autosomal loci,plum eyes and curled wings,place appropriate symbols (of your designation)on chromosomes in the drawings you made in part (A)above.Assume no crossing over,and there may be more than one correct answer in some cases.
c) Assuming that a somatic G2 nucleus from one of the individuals in this scenario contains about 8.0 picograms of DNA,how much nuclear DNA would you expect in each of the cells mentioned above?

Drosophila Melanogaster,the Fruit Fly,has a 2n Chromosome Number of 8