Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Biology Expert

1 Two new hair dyes A and B were tested in the Ames test. Both were tested with and without liver homogenate. Two auxotrophic strains of bacteria were used, one in which the auxotrophy was caused by a nonsense mutation (mutant 1) and the other by a frameshift mutation (mutant 2). After treatment the cells were plated on minimal medium. The + signs show experiments in which prototrophic colonies were observed. describe the mutagenic action of these chemicals, and say which would probably be safe for human use.

2. In a tetraploid plant the A and B loci are centromere-linked and on separate chromosomes. The following cross is made:
A/A/A/A ; b/b/b/b X a/a/a/a ; B/B/B/B
And an F1 is obtained that is selfed to give an F2. If only one dominant allele is needed to give the dominant phenotypes at each locus, what phenotypes are expected in the F2 and in what proportions?

3.. In Drosophila, a cross is made involving two closely linked genes on the very small chromosome 4. a and b are recessive alleles.
Female a b+ / a+ b X male a b / a b
In the progeny, the expected common types were found, but there was also one rare wild type female.
(a) describe what the common progeny phenotypes are expected to be, and give their proportions.
(b) Could the rare wild type female have arisen by crossing over? By nondisjunction? describe your answers.
(c) The rare wild type female was test-crossed to a male tester of genotype a b / a b, and the progeny of the test cross were
1/6 wild type
1/6 expressed both recessives a and b

Biology, Academics

  • Category:- Biology
  • Reference No.:- M928218

Have any Question? 


Related Questions in Biology

Discussionwhat process would you use to create professional

Discussion What process would you use to create professional standards and institutional ethics within your healthcare facility, and what sources of information would you use to set those standards and ethics?

Focusing on thenbsprespiratory digestive urinary and

Focusing on the  respiratory, digestive, urinary, and reproductive systems.   Create a scenario  and give your patient a disease associated with any of these systems and present the history and symptoms of the particular ...

Answer the following questionwhat is the domain and kingdom

Answer the following question: What is the domain and kingdom for an organism that has a nucleus, is not motile, and does not perform photosynthesis? What is taxonomy? What role does this serve? How does taxonomy assist ...

Discuss the mechanisms by which the lactoselac operon

Discuss the mechanisms by which the lactose(lac) operon functions in medium with an excess of lactose and a medium with lactose excess and glucose. Give 10 points

For this assignment continue to write about the current

For this assignment, continue to write about the current organization you work for or one that you worked for in the past. Before writing this paper, make sure to thoroughly review the background readings. Think carefull ...

What did the experiments by stanley miller demonstrate

What did the experiments by Stanley Miller demonstrate about the formation of the first organic molecules? Why was it significant?

A man and wife have a daughter she marries and has a son

A man and wife have a daughter. She marries and has a son who is colorblind, a sex-linked trait. She has normal vision. Using the letters "C" and "c", list all potential genotypes for the man and his wife. What is the pr ...

Please describe four different categories of tissue

Please describe four different categories of tissue engineering strategies for repairing bone and cartilage injuries separately, and compare the advantages and disadvantages of these strategies?

1 describe the difference between a tumor suppressor gene a

1. Describe the difference between a tumor suppressor gene, a proto-oncogene, and an oncogene. Provide an example of each. 2. Cervical cancer is mainly caused by human papilloma viruses (HPVs). Explain how viruses contri ...

1 describe the formation of a cp air mass and then discuss

1. Describe the formation of a cP air mass and then discuss the typical weather it produces and the changes it undergoes as it travels across the Great Lakes and moves southward. 2. Describe the typical life cycle of a m ...

  • 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

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen