Solution-Determine a genetic map for these genes | Homework Helpers

1. The Drosophila genes scute, echinus and vestigial have as non-wild-type alleles sc (short for scute, or loss of certain thoracic bristles), ec (short for echinus, or roughened eye surface), and vg (short for vestigial wing). A wild-type true breeding fly is crossed with a triply recessive fly. The F1 females are testcrossed with tester males. The progeny are listed as gametic genotypes derived from the F1 females. Eight gametic types are possible, and they were counted in the following numbers in a sample of 1008 progeny flies:

sc · ec · vg                            235

Don't use plagiarized sources. Get Your Custom Essay on
Solution-Determine a genetic map for these genes | Homework Helpers
Get an essay WRITTEN FOR YOU, Plagiarism free, and by an EXPERT!
Order Essay

sc+ · ec+ · vg+                      241

sc · ec · vg+                          243

sc+ · ec+ · vg                        233

sc · ec+ · vg                          12

sc+ · ec · vg+                        14

sc · ec+ · vg+                        14

sc+ · ec · vg                          16


A. Are the genes linked or unlinked? Explain your answer.

B. Determine a genetic map for these genes.

C. Based on the information you have gathered, how would you write the genotype of the parents of the testcross?

2. Mrs. Smith and Mrs. Doe were roommates at Harris Hospital and both had daughters at about the same time. After Mrs. Smith took Susie home, she became convinced that the babies had been switched.

Blood tests were performed with the following results:

Mr. and Mrs. Smith were both type AB;

Mr. and Mrs. Doe were both type A;

Susie Smith was type A and Debbie Doe was type O.

Had a switch occurred?

A. Determine the genotype of all the individuals involved.

B. Determine if a switch has occurred. Justify your answer discussing the children’s genotypes and using support from the parental genotypes.

3. In humans, sickle-cell anemia is caused by a recessive lethal allele Hbs; individuals who are HbaHbs have sickle-cell trait, but are healthy.

A. What is the probability of two heterozygous individuals giving birth to a child with sickle-cell trait?

B. What is the probability of two heterozygous individuals giving birth to a child with sickle-cell anemia?

C. If a normal HbaHba individual receives a blood transfusion from a HbaHbs individual (heterozygous for sickle cell) what are the chances that the HbaHba man and his HbaHba wife will have HbaHbs children?

4. Determine the mode of inheritance of the following trait:


Support your conclusion using references to specific individuals of the family.

Calculate your paper price
Pages (550 words)
Approximate price: -

Why Choose Us

Top quality papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

Professional academic writers

We have hired a team of professional writers experienced in academic and business writing. Most of them are native speakers and PhD holders able to take care of any assignment you need help with.

Free revisions

If you feel that we missed something, send the order for a free revision. You will have 10 days to send the order for revision after you receive the final paper. You can either do it on your own after signing in to your personal account or by contacting our support.

On-time delivery

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & confidential

We use several checkers to make sure that all papers you receive are plagiarism-free. Our editors carefully go through all in-text citations. We also promise full confidentiality in all our services.

24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.


Essay Writing Service

You are welcome to choose your academic level and the type of your paper. Our academic experts will gladly help you with essays, case studies, research papers and other assignments.


Admission help & business writing

You can be positive that we will be here 24/7 to help you get accepted to the Master’s program at the TOP-universities or help you get a well-paid position.


Editing your paper

Our academic writers and editors will help you submit a well-structured and organized paper just on time. We will ensure that your final paper is of the highest quality and absolutely free of mistakes.


Revising your paper

Our academic writers and editors will help you with unlimited number of revisions in case you need any customization of your academic papers