Ask Question, Ask an Expert

+61-413 786 465

info@mywordsolution.com

Ask Biology Expert

Instructions: Below are five problems you should solve all five problems. You may use the discussion board to ask your fellow students problems about their approach to these problems and to discuss necessary information to solve the problems. However please do not post complete solutions. Once you have completed the problems choose the two from problems you are most confident and submit your answers to those problems to the assignment folder. When solving problem 5 be careful and think like a scientist.

problem: The genes for ruby eyes (rb), tan body (t) and cut wings (ct) are all found on the X-chromosome of Drosophila melanogaster. All of these are recessive traits. They map in the order rb, ct, t with 12.5 map units between rb and ct and 7.5 map units between ct and t. Suppose you cross a cut wing male with a homozygous female that is both tan and has ruby eyes.

a) What will the F1 females look like?

b) Draw map of the section of the X chromosomes that has these 3 genes for the F1 females

c) Assume you testcross your F1 females.

• What progeny classes would you expect?
• Give approximate numbers for each class based on a total of 2000 progeny.

Assuming i = 1 and there are no double crossovers.
Assuming i = 0 and there are the expected number of double crossovers.

problem: The Neurospora cross was made between a strain that carried mating type A and the mutant allele arg-1(arg) and another strain the carried mating-type a and the wild type arg-1 (+) gene. Four hundred linear octads were isolated and they fell into the 7 categories given in the table below.

a) Label each class and PD, NPD or TT
b) Are the genes linked?
c) What are the map distance between these genes and the centromere?

1475_neurospora table.jpg

problem: Assume you are analyzing the information from 4 generations of a human family that has an autosomal recessive disorder. You have an RFLP band that is linked to the gene for the disorder. The recombination frequency between the gene and the RFLP is 20%. The data from this family is presented in a table below.

a) What is the probability II1 is a carrier?
b) What is the probability III4 is a carrier?
c) IV2 has not been born yet but amniocentesis has given the banding pattern shown. What is the probability he will have the disorder?

977_probability of disorder.jpg

problem: You have four lines of mice that are homozygous at two linked  loci. One line has a waltzing gait (W W) and a bent tail (BB)  another has normal gait (ww) and a straight tail (bb); the third waltzing gait(WW) and straight tails(bb) and the forth has normal gait (ww) and bent tails (BB). W is dominating to w and B is dominating to b. You cross the pairs of mice and produce an F1 generation. Then you mate the sibs from the F1 generation to each other. What is the chromosomal complement for each of the mice a-c in the table?

1502_chrosomal table.jpg

problem: Drossophila females of normal appearance but heterozygous for three autosomal genes are mated to males that are homozygous recessive for the three genes: glassy eyes, coal-color bodies and striped thoraxes. 1000 progeny from this cross are scored:

988_genetic map table.jpg

a) Draw the genetic map based on these data
b) Show the arrangement of the genes on the two homologs in the heterozygous female including the distance between the genes in cM.
c) Based on your map what is the expected number of double cross overs?

Biology, Academics

  • Category:- Biology
  • Reference No.:- M9138

Have any Question? 


Related Questions in Biology

John is a 53-year old contraction worker who has come into

John is a 53-year old contractIon worker who has come into your office complaining of a sore knee joint. You see a buildup fluid close to the patella (kneecap) but deep to the skin and suspect the soreness is due to burs ...

Duchenne muscular dystrophy md is a recessive sex-linked

Duchenne muscular dystrophy (md) is a recessive, sex-linked inherited disease in humans. A cross between a normal man and a woman who is a carrier of this trait, what are the odds that a sons or daughters would have MD? ...

Use of molecular tools and bioinforrnatics in the diagnosis

Use of Molecular Tools and Bioinforrnatics in the Diagnosis Characterization of Enteric Pathogens from a Case Study Purpose: The purpose of this project is to familiarize the student with modern molecular tools and bioin ...

What types of molecular interactions occur between the

What types of molecular interactions occur between the active site and the substrate?

If the atomic number of an element is 12 and the atomic

If the atomic number of an element is 12 and the atomic mass is 25. How many protons are there in the nucleus? How many neutrons are there in the nucleus? How many electrons are in the atom?

Assignment 1 biotechnology articleassignment 1 is the first

Assignment 1: Biotechnology Article Assignment 1 is the first phase of a project that you will complete, in stages, during the term. You will begin by selecting a specific biotechnology that you would like to cover throu ...

Two true-breeding stocks of pea plants are crossed one

Two true-breeding stocks of pea plants are crossed. One parents has red, axial flowers and the other has white terminal flowers; all F1 individuals have red, axial flowers. The genes for flower color and location assort ...

2croh3nbspnbsp3br2 10oh-6br-nbspnbsp2cro42- 8h2oin the

2Cr(OH) 3  +  3Br 2 + 10OH - 6Br -  +  2CrO 4 2- + 8H 2 O In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.

Is the iso-osmotic point different for different solutes

Is the iso-osmotic point different for different solutes? Please specify in what ways can the iso-osmotic points be different and why there is a difference.

Question phytoplankton chemosynthesis and mitochondriafor

Question: "Phytoplankton, Chemosynthesis, and Mitochondria" For your primary post, please respond to one of the following three topics with a post of at least 125 words that addresses each point given in the instructions ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Why might a bank avoid the use of interest rate swaps even

Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate

Describe the difference between zero coupon bonds and

Describe the difference between zero coupon bonds and coupon bonds. Under what conditions will a coupon bond sell at a p

Compute the present value of an annuity of 880 per year

Compute the present value of an annuity of $ 880 per year for 16 years, given a discount rate of 6 percent per annum. As

Compute the present value of an 1150 payment made in ten

Compute the present value of an $1,150 payment made in ten years when the discount rate is 12 percent. (Do not round int

Compute the present value of an annuity of 699 per year

Compute the present value of an annuity of $ 699 per year for 19 years, given a discount rate of 6 percent per annum. As