Karyotyping Assignment

Mapping of chromosomes is called as Karyotyping. The biologists who study the chromosomes and the anomalies are cytogeneticists and the study is called as cytogenetics.

I want you to go to this website and play with it. You have to match all the 23 pairs of chromatids and get to this page as follows. In this discussion, I want you to post a picture of completed karyotype and discuss on following questions:

  1. Is it a karyotype of a female or a male?
  2. Name one disorder which has abnormal number of chromosomes
  3. What would be the cause of the disorder; is it genetic, the mother’s age, and some other reason. Explain.
  4. As earlier, please post your comments for two other discussions to earn full points of this discussion.

Karyotyping: https://learn.genetics.utah.edu/content/basics/karyotype/

 
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SC160 Basic Biology Assignment 3 Essential Biology Discussion

Directions: Be sure to save an electronic copy of your answer before submitting it to Ashworth College for grading. Unless otherwise stated, answer in complete sentences, and be sure to use correct English, spelling and grammar. Sources must be cited in APA format. Your response should be four (4) double-spaced pages; refer to the “Assignment Format” page located on the Course Home page for specific format requirements.

 

 

Complete Question Text: Integrate by discussion the properties of life, basic chemical terminology, and molecules and compounds of a cell necessary for life. Include the basic anatomy and physiology of a cell and describe how cell respiration, photosynthesis, and cell reproduction occur in a succinct manner. Include a brief discussion about Mendel’s Laws and an overview of DNA structure and function. Conclude with a discussion of cancer and the mechanisms of gene control

 
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Drosophila Lab Report

Drosophila lab report.

1) I will upload for you the drosophila lab report Rubric.

2) I will upload the data of F2 phenotype.

3) the lab report expected ratios:

independent assortment 9:3:3:3

Genetics linkage 9:3:3:1

x linked / autosomal 2:1:1 ( female wt : male wt: male mutant )

3:1 ( wt : mutant ) apterous.

4) I will upload an introduction for this lab report but at the same time there is a lot of mistakes , you have to read the comment and correct them.

be careful please about the plagiarism and the read the citation required

not any citation be allowed, there is a required citation like peer review , journal …………………

1

 

Sandy Yossef Comment by Elizabeth Jackson: Grade:-2 hypotheses-2 chromosome locations-2 mutant lines-1 citation formatting-1 missing lab manual and flybase sources-1 grammar/italics6/15

Genetics lab

BIOL 3251-010

Assignment 1

Drosophila melanogaster, the common fruit fly, is a well-known model organism used for genetic research. The laboratory exercise will aid in differentiating normal ‘wild type’ and various mutant phenotypes of the fruit fly. The laboratory exercise will help in developing an understanding of the connection between the presence and absence of genetic trait of the general fruit fly population. Comment by Elizabeth Jackson: Drosophila melanogasterItalicize scientific names.Also, you should start with a statement about genetic inheritance. Comment by Elizabeth Jackson: It is too early in the introduction to talk about your own project. Focus on background information first.

Genetic science has identified and documented over 2,500 species of Drosophila. Out of these numbers of Drosophila one specie; Drosophila melanogaster (Fruit fly) has been primarily exploited as a model for genetic research. The D. melanogaster is the most suitable model for genetic work because of its short life cycle. This species lives for about 10 to 11 days and its optimum survival temperature is 220 C (Wangler, Yamamoto & Bellen, 2015). Another primary model advantage is that D. melanogaster has high reproductive potential. The species reproduces a large number of progeny. Such a large number of progeny is required for statistical analysis of results (Wolf, & Rockman, 2008). The general characteristics of genetic model organisms include a short generation time, a large number of progeny and easy genetic manipulation. Comment by Elizabeth Jackson: You need a citation for this.

Genetic scientists still have numerous biological processes to discover. The D. melanogaster has many possibilities because this model can quickly and efficiently answer questions of biological phenomena (Wangler, Yamamoto & Bellen, 2015). The D. melanogaster is an excellent model because it has a translational impact for genetic disease and a large number of medical implications including vector-borne illnesses. Comment by Elizabeth Jackson: You need citations for sentences like this.

This laboratory will use a wild-type D. melanogaster. Both male and females will use. The two sexes are differentiated in ways of physical characteristics. For example, males have a sex comb, a fringe of black bristles on their forelegs (Wolf, & Rockman, 2008). The male’s abdomens are elongate and rounded in males, but characteristically pointed in females. The wild type is the naturally occurring fly with not mutation. Other mutant flies that are common in the laboratory during breeding and that needs to be isolated from the wild-type ebony mutants that exhibit a much darker body as compared to the wild type fly (Wolf, & Rockman, 2008). Other common mutants are referred to as white-eyed female, wild type heterozygote female, white-eyed male, and wild type male. Comment by Elizabeth Jackson: Did we use this as a method for sexing the flies? Comment by Elizabeth Jackson: We didn’t look at ebony mutants in this lab. Comment by Elizabeth Jackson: This sentence doesn’t really make sense. You say “other common mutants”, but then you mention wildtypes. By definition, wildtypes are the exact opposite of mutants.

Flies with shortened wings are referred to as having vestigial genes that occur in the second chromosome. The vestigial genes occur due to recessive vg allele that specifies short vestigial wings. The flies have a recessive mutation of vestigial genes that occur in the second chromosome for both parents (Wolf, & Rockman, 2008). Other flies exhibit curled wings resulting from curly genes that also occur in the second chromosome. The flies those are yellow than normal exhibit yellow genes resulting from mutations occurring in the X chromosome (Wolf, & Rockman, 2008). The dark bodied flies carry a defect in their eye resulting to flies with phenotypic ebony genes. The ebony genes occur in the third chromosome and are responsible for building up a tan-coloured pigment. Comment by Elizabeth Jackson: Did you use flybase for this? If so, you need a citation. Comment by Elizabeth Jackson: We didn’t look at curled wings.

Complete and incomplete linkages in D. melanogaster occur independently. For example, the grey body and the long wing phenotype of this fly dominate over the black body and vestigial wings characteristics. Crossing over of genes occurs in the first generation, but the phonotype does not continue to the second generation (Garud, Messer, Buzbas, & Petrov, 2015). However, if the cross-over continued to the next generation it could be referred to as a complete linkage. Complete linkage in D. melanogaster genes is a rarity among female phenotype, but is common among the male mutant phenotype. The male mutant genes are closely associated and always transmitted together.

Reference

Garud, N. R., Messer, P. W., Buzbas, E. O., & Petrov, D. A. (2015). Recent selective sweeps in North American Drosophila melanogaster show signatures of soft sweeps. PLoS genetics11(2), e1005004. Comment by Elizabeth Jackson: The first authors of your citations are correct, with their last names first, followed by their first and middle initials. The other authors should have their initials first, followed by their last names. Comment by Elizabeth Jackson: Drosophila melanogaster

Wolf, M. J., & Rockman, H. A. (2008). Drosophila melanogaster as a model system for the genetics of postnatal cardiac function. Drug Discovery Today: Disease Models5(3), 117-123.

Wangler, M. F., Yamamoto, S., & Bellen, H. J. (2015). Fruit flies in biomedical research. Genetics, genetics-114.

 
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Microbiology Lab

2420-Lab 3- Bacterial Staining Techniques-II-(Differential)

Directions:

Answer following questions after reading the information and watching the video from the link below. Use color RED or BLUE for your answers. Submit the completed document on eCampus for grading. Refer to

· the textbook chapter 3 (3.2) (Nester- McGraw Hill)

· LinkBacterial Staining Techniques-IIVirtual Edge Experiment-4

Differential Staining

1. What is differential staining?

Gram Staining (4A on Virtual Edge)

Watch the video of Gram Staining from the textbook chapter 3- review 3.2 (pages 53-54), 3.5 (pages 65-67– cell wall of prokaryotic cells) and answer the following questions.

2. What is the purpose of Gram staining?

3. Who invented the Gram staining procedure?

4. What is the first stain used in Gram staining procedure?

5. Do all cells pick up this stain?

6. What is the function of a mordant?

7. Which mordant is used in the Gram staining procedure?

8. What would be the result if the mordant is forgotten from the procedure?

9. What is alcohol used for?

10. Why is decolorization necessary?

11. What is a counterstain?

12. Which counterstain is used in Gram staining?

13. What are cells called that retain the primary stain?

14. What are cells called that lose the primary stain?

15. What are cells called that take up the counterstain?

16. What type of cells do not take up the counterstain?

17. After the Gram staining procedure, Gram positive bacterial cells appear ______________ colored.

18. After the Gram staining procedure, Gram negative bacterial cells appear ______________ colored.

19. Which component of the cell wall in Gram positive bacteria is responsible for the retention of the primary stain?

20. Which component of the cell wall in Gram negative bacteria is responsible for the retention of the counterstain?

21. What would be the color of Gram negative bacterial cells if the decolorization step is forgotten? Explain.

22. Which bacteria were used in this experiment and what were their shapes? (From the textbook, review 3.3- Morphology of prokaryotic cells)

23. From what you have learned from the textbook, if a patient has E. coli infection which are Gram negative bacteria, would you advise them to take a course of Penicillin? Why or Why not?- Explain

24. Following picture shows the Gram staining result. Point out (or describe) Gram positive and Gram negative cells from the picture. Be sure to specify morphology:

Gram stain - Wikipedia

Acid-fast Staining- (4B on Virtual Edge):

Read the text from the following to help answering the following questions.

· link Acid-fast Staining,

· textbook chapter 3- section 3.2

25. List two genera of bacteria that are stained for identification by using Acid-fast staining method.

26. Which fatty acid is found in the cell walls of acid-fast bacteria?

27. Which primary stain is used in the acid-fast staining procedure?

28. Why is steaming necessary at this step?

29. Which counterstain is used in the acid-fast staining procedure?

30. Why is acid-alcohol used to decolorize in the acid-fast staining process instead of regular ethanol?

31. Which two types of bacteria were used in this experiment?

32. Which of the above two types of bacteria were acid-fast? (or retained the primary stain?)

33. From the picture below, point out the acid-fast cells:

Acid Fast Staining Flashcards | Quizlet

34. If you are working in a clinical diagnostic laboratory, which of the above staining methods would you use to predict the cause of infection under following conditions?

a. Tuberculosis

b. Strep throat

 
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