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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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colleen colleen
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10 years ago
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 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 previously 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 for part (a). Assume no crossing over, and there may be more than one correct answer in some cases.

(c)  Assuming that a somatic G2 nucleus from the individuals mentioned above contains about 8.0 picograms of DNA, how much nuclear DNA would you expect in each of the cells mentioned in part (a)?
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Sunshine ☀ ☼
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padrepadre
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10 years ago
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Krys G,  genepic,  husker91
Mastering in Nutritional Biology
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colleen Author
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#2
Valued Member
10 years ago
You made this sound so easy Slight Smile
Sunshine ☀ ☼
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#3
10 years ago
Thank you! So helpful!
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#4
10 years ago
SUPER helpful! thanks!!!
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#5
10 years ago
I finally understand what it's saying. Thanks.
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#6
10 years ago
Quote from: padre (10 years ago)
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Thanks, I had problems with this type of question also.
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#7
10 years ago
Thank you so much! you saved my butt
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#8
10 years ago
thanks
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#9
Staff Member
Educator
10 years ago
NP
Mastering in Nutritional Biology
Tralalalala Slight Smile
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#10
10 years ago
Very helpful!
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#11
10 years ago
That made a lot more sense. Thank you.
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#12
Staff Member
Educator
10 years ago
Thanks, you're all too kind ha!
Mastering in Nutritional Biology
Tralalalala Slight Smile
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#13
10 years ago
helpful
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