How can you tell whether DNA sequences from two sources are similar by chance or instead by common origin?

The following two sequences represent the same gene from two different species: Assume that all changes in the third position are synonymous and all in the first and second positions are nonsynonymous. a) How many synonymous sites (positions) are there in the gene?  b) How many nonsynonymous sites (positions) are there in the gene?  c) How many synonymous substitutions are there between species?  d) How many nonsynonymous substitutions are there between species?  e) What is the dN/dS ratio?  f) What does the dN/dS ratio tell you about the evolution of this sequence?  Finally, It has been hypothesized that population size affects genome size. What is the proposed relationship? How can it be explained?

What are the mechanisms in which DNA genomes evolve?  Discuss two or more and provide examples and why

What is it that forms the basis of DNA fingerprinting?

At the beginning of the 20th century, scientists argued whether DNA or protein would be the element of "inheritance?" a) Which molecule did they think would carry all the genetic information and why? b) Describe the contribution of Griffith, Avery et al., Hershey & Chase, and Watson and Crick in the field of genetics. Edit View Insert Format Tools Table 12pt v Paragraph v BI BIUA ev T v 目、 总 ..

How to Identify structural sequences, such as telomericsequences, in chromosomes ?