Ask Question, Ask an Expert


Ask Biology Expert

A strain of Aspergillus was subjected to the mutagenesis by X rays, and two tryptophan-requiring mutants (A and B) were isolated. These tryptophan-requiring strains were plated in huge numbers to obtain revertants to wild type. You failed to recover any revertants from mutants A and recovered one revertant from mutant B. This revertant was crossed with a normal wild-type strain. What proportion of the progeny from this cross would be wild type if:

a) The reversion accurately reversed the original change that produced the typ- mutant allele?

b) The revertant phenotype was generated by a mutation in a second gene located on a dissimilar chromosome (the new mutation suppresses trp-)?

Suggest a description of why no revertants from mutant A were recovered.

Biology, Academics

  • Category:- Biology
  • Reference No.:- M937701

Have any Question? 

Related Questions in Biology

1 identify list the two basic types of cells2 would you

1. Identify (list) the two basic types of cells. 2. Would you find proteins inside cells or cells inside proteins? (choose one answer) 3. What two things make osmosis a special type of diffusion? 4. What is a selectively ...

Nacano lr et al 2014 evaluation of seasonal dietary

Nacano LR et al. (2014). Evaluation of seasonal dietary exposure to arsenic, cadmium and lead in schoolchildren through the analysis of meals served by public schools of Ribeirão Preto, Brazil. Journal of Toxicology and ...

Human biologydiscussion 1define obesity and identify why it

Human Biology Discussion 1 Define obesity and identify why it is considered to be a health risk. Discussion 2 The male and female reproductive systems are controlled by hormones and feedback systems. Identify and discuss ...

Ethical decisions in the workplaceafter reading your

Ethical Decisions in the Workplace After reading your background readings, please review the following scenario and address the questions at the end. Jerry Stevens heads up an excavation crew for the municipal utilities ...

Evolutionary biology in the age of genomics- q1

Evolutionary Biology in the age of Genomics- Q1. Phylogenetic trees- You are analyzing sequences sampled from four turtle species (A-D), considering a genomic region that is 75 base pairs long. You observe the following ...

Unit idiscuss why it is important that the public be

Unit I. Discuss why it is important that the public be knowledgeable about science and how it applies to the real world. Unit II Oil spills in the ocean are often treated with chemical dispersants. These materials are si ...

Assignmentbegin with the information in dna a specific gene

Assignment Begin with the information in DNA, a specific gene. Describe how this genetic information results in the formation of a protein. Define mutation. Explain two specific types. Describe five different methods of ...

Mutations can lead to missing or malformed proteins that

Mutations can lead to missing or malformed proteins that can lead to disease. A group of scientists in the United Kingdom have published a paper in the American Journal of Human Genetics stating that the average person h ...

A dna module consists of 4000 nucleotides of which 20

A DNA module consists of 4000 nucleotides, of which 20% contain the base adenine. How many of the nucleotides in the DNA molecule will contain guanine?

Q1 you have crossed true breeding purple peppers aabb with

Q1. You have crossed true breeding purple peppers (AABB) with true breeding yellow peppers (aabb). The resulting F 1 progeny were all purple. When you intercrossed two of the F1 plants, you got the following results: 26 ...

  • 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

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate