transduction test/linear order of genes

Hi. Can someone please show me how to do the following problem? "The data in the table below were obtained from 3-point transduction tests made to determine the order of mutant sites in the A gene for tryptophan synthetase in E coli. The gene anth is a linked, unselected marker. In each cross, trp+ recombinants were selected and then scored for the anth marker (anth+ or anth-). What is the linear order of anth and the three mutant alleles of the A gene indicated by the data in the table? Cross 1: Donor markers: anth+ A34 Recipient markers: anth- A223 anth allele in recominants: 72 anth+/332 anth- Cross 2: Donor markers: anth+ A46 Recipient markers: anth- A223 anth allele in r... click for more

conjugational cross/gene order

Analyze the data in the Table and determine the relative order of the four lac alleles with respect to the flanking pro and ade loci.

produces a pedigree

how can i produce a peddigree that has 3 generations and a trait for Handedness what is the predicton of mode of inheritance?

Help required with genetics

Hi, I have an exam next week on Cell Biology. I am struggling to come to terms with Genetics aspect of the module. Most specifically, the following topics: DNA Replication Gene Expression Protein Synthesis I am going to attach the powerpoint presentations for each topic which contain the notes. However, I find them confusing. I would appreciate it if you could please explain all the above concepts to me in a clear, concise and step by step manner. If you could either summarise the notes for me, or provide your own; as long as they are simple and easy to follow. To help, this is what the module book says for each topic: DNA Replication The DNA duplex is ideally sui... click for more

There are four different nucleotides, combinations of which construct genetic code and specify 20 different amino acids.

How can only four different nucleotides be used to construct a genetic code that will specify 20 different amino acids?