Question

Choose the correct answers from the alternatives given .
DNA nucleotide differences between organisms

• A. indicate that evolution occurs
• B. indicate how closely related organisms are
• C. explain why there are phenotypic differences
• D. all of these

Answer 1

The correct option is D all of these

At the most basic level, living organisms share:

• The same genetic material (DNA)
  
• The same, or highly similar, genetic codes
  

• The same basic process of gene expression (transcription and translation)
  
• The same molecular building blocks, such as amino acids.
  

These shared features suggest that all living things are descended from a common ancestor and that this ancestor had DNA as its genetic material, used the genetic code, and expressed its genes by transcription and translation. Present-day organisms all share these features because they were "inherited" from the ancestor (and because any big changes in this basic machinery would have broken the basic functionality of cells).

However, not all nucleotide or their sequence in DNA is the same among organisms. Rather this difference is what makes them different from each other. These sequences are expressed to result in different phenotypes. Also, closely related organisms show less difference among their nucleotides. These organisms gradually diverged from each other resulting in a new species at some point in time.

So, the correct option is 'All of these'.