StudentShare
Contact Us
Sign In / Sign Up for FREE
Search
Go to advanced search...
Free

Genetics: Questions on Drosophila practical - Essay Example

Cite this document
Summary
My fly count for female 57 wild-type: 13 vestigial: 17 ebony: 5 ebony vestigial My female fly ratio 12:3:3:1…
Download full paper File format: .doc, available for editing
GRAB THE BEST PAPER98.3% of users find it useful
Genetics: Questions on Drosophila practical
Read Text Preview

Extract of sample "Genetics: Questions on Drosophila practical"

1. No 2. The genotype of the male parental flies e/e ; vg+/vg+ 3. The genotype of the female parental flies e+/e+ ; vg/vg 4. e ; vg+ 5. e+ ; vg 6. Yellow- brown colour with normal size wings7. e+/e ; vg+/vg8. e+ ; vg+ e+ ; vg e ; vg+ e ; vg9. TruePunnett table MaleFemalee+ ; vg+e+ ; vge ; vg+e ; vge+ ; vg+e+/e+ ; vg+/vg+wild-typee+/e+ ; vg+/vgwild-typee+/e ; vg+/vg+wild-typee+/e ; vg+/vgwild-typee+ ; vge+/e+ ; vg+/vgwild-typee+/e+ ; vg/vgvestigiale+/e ; vg+/vgwild-typee+/e ; vg/vgvestigiale ; vg+e+/e; vg+/vg+wild-typee+/e; vg+/vgwild-typee/e; vg+/vg+ebonye/e; vg+/vgebonye ; vge+/e ; vg+/vgwild-typee+/e; vg/vgvestigiale/e; vg+/vgebonye/e; vg/vgebony vestigialPhenotype ratio: 9 wild-type: 3 vestigial: 3 ebony: 1 ebony vestigial10.

Punnett table abov11. 9: 3: 3: 112. My fly count for female 57 wild-type: 13 vestigial: 17 ebony: 5 ebony vestigial My female fly ratio 12:3:3:1 My male fly count 49 wild-type: 12 vestigial: 20 ebony: 7 ebony vestigial My male fly ratio 7:2:3:113.

Female ratio 15:4:4:1 Male ratio 15:4:4:114. The differences in both of the answers may be because of two reasons. The first is the number of flies taken was too small to give us a significant output. Next the crossing or the experiment was executed poorly.In order to see if the difference between the two ratios is statistically significant or not I would perform the chi square test analysis.

For each phenotypic class in the F2, we compute the difference between the observed and the expected offspring and square the difference. This is again divided by the expected number.There exists a critical value which is calculated on the basis of the degrees of freedom. Say we have 4 phenotypic expressions then the degree of freedom would be 4-1=3. A standard chart gives the critical value corresponding to 3 is 7.8. If the chi square result is below this critical value then the difference is not significant.

However if the value exceeds the critical value then there is significant difference and the observed data do not fit the hypothesis being tested (Snustad & Simmons,2010,p53).15. The genes that cause ebony and vestigial are recessive in nature. This is so because only when both the copies are recessive only then the phenotypes are expressed. They are not expressed in homozygous condition thereby proving that they are recessive.Both of the genes are linked to autosomal chromosomes. This is so because the ratios that I obtained are not very much different between the males and the females.

The female ration I obtained is 12:3:3:1 while the male ratio is 7:2:3:1.Yes, both the genes i.e. genes for ebony and vestigial are linked on the same chromosome which is evident by comparison of the ratios obtained. Most of the offsprings show parental phenotypes. The results I obtained are vastly different from the data given in the whole year group However; to be sure I would need to perform a testcross to see what the percentage of recombination between the alleles is. Genes that are linked together tightly do not recombine whereas gene which are not tightly linked give more recombination (Campbell & Reece,2009,p293).

ReferencesCampbell & Reece.(2009).Biology, New York:Pearson Benjamin Cummings.PrintSnustad.P.D. & Simmons,M.J.(2010).Principles of Genetics,London:JohnWiley.Print

Read More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Genetics: Questions on Drosophila practical Essay”, n.d.)
Retrieved from https://studentshare.org/biology/1639099-genetics-questions-on-drosophila-practical
(Genetics: Questions on Drosophila Practical Essay)
https://studentshare.org/biology/1639099-genetics-questions-on-drosophila-practical.
“Genetics: Questions on Drosophila Practical Essay”, n.d. https://studentshare.org/biology/1639099-genetics-questions-on-drosophila-practical.
  • Cited: 0 times

CHECK THESE SAMPLES OF Genetics: Questions on Drosophila practical

Genesis of Different Cranial Placodes in Vertebrates

n drosophila, it has first been shown that sine oculis and eyes absent-homologues of the vertebrate Six1/2 and Eya genes, respectively-form a regulatory network essential for compound eye development together with the nuclear protein dachshund and the Pax6 homologue eyeless.... Gehring, Direct regulatory interaction of the eyeless protein with an eye-specific enhancer in the sine oculis gene during eye induction in drosophila, Development 126 (1999), pp....
3 Pages (750 words) Essay

Drosophila Melanogaster Fly

drosophila melanogaster is a fruit fly, a small insect of the kind that gathers around spoiled fruit.... drosophila has been used as a representative organism for research for almost a century, and today, several thousand scientists are effective on many different characteristics of the fruit fly. … Part of the explanation people work on it is chronological - so much is previously known about it that it is easy to hold and well-understood - and part of it is realistic: it's a small animal, with a short life succession of just two weeks, and is inexpensive and easy to keep great numbers....
5 Pages (1250 words) Essay

Genetic Relations to Job Satisfaction

This has brought into focus several questions such as: “How true is it that the level of competence in a person is equal to that of the parent?... It is this questions that this paper seeks to provide answers to as we determine through previous research if, indeed, job satisfaction is genetic.... nbsp;genetics is the subdivision of biology that looks at heredity, narrowing down to the system of hereditary spread and variation of inherited traits among similar or linked creatures....
4 Pages (1000 words) Essay

Molecular Aspects of Conservation Genetics

994). The up to date research in the field of conservation genetics has substantially assisted Scientific genetic approaches have made it easier to identify the cryptic species in particular taxa, and thereby have conservational significance.... 1994).... Rapid climate changes, widespread deforestation and extraction of the resource (Laurance et al....
4 Pages (1000 words) Essay

Drosophila

They… The drosophila qualifies to be the best for trialing because they have only four chromosomal pairs.... Biology drosophila drosophila is the best genetic model for innumerable laboratory experiments because they are small in size.... The drosophila qualifies to be the best for trialing because they have only four chromosomal pairs.... Additionally, the drosophila has very large polythene chromosomes, which are located within the salivary glands of this organism....
2 Pages (500 words) Research Paper

Genetics: Read description for more details about topic

The objective of the study was to assess if the females of drosophila Melanogaster, wild type strain, produce the same number of offspring when are given a choice between wild type males and mutant males with mutation for eye morphology including LOBE, ANTENNAPEDIA and BAR… The study was conducted using drosophila melanogaster wild type females and males of wild type and mutant strains LOBE (L), ANTENNAPEDIA (antp) and BAR (B).... he results along with the chi square and p values confirm that in contrast to preference for eye color mutation the wild type virgin female flies sexually select wild type males over males with mutation for eye morphology drosophila melnogaster is an extensively studied organism....
15 Pages (3750 words) Lab Report

Genetics Experiments

In a mutant Jimson weed, chromosome B is present in three copies whereas all other chromosomes are in a diploid state.... Jimson weed pollen grains do not tolerate multiple chromosomes and are incapable of fertilization (Crow and William 107).... However, the ovum is capable of… If you fertilize a trisomic Jimson weed plant, what zygotes would be formed?...
4 Pages (1000 words) Essay

Genetic Composition

genetics to twins may be of same genetic composition, 100 percent for identical twins and 50 percent for non-identical twins.... Handbook of behavior genetics.... More to the point, when twins are raised together, they may have similar behavior due to the environment in which they are raised in....
1 Pages (250 words) Assignment
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Contact Us