Question

question # 5
long text (essay)
why is dna profiling considered a valid means of identification? describe the structure of dna. how does dna relate to genes and chromosomes?

Explanation:

DNA profiling is valid as each person's DNA is unique (except identical twins). DNA has a double - helix structure made of nucleotides. Genes are segments of DNA that code for proteins, and chromosomes are long strands of DNA wrapped around proteins.

Answer:

DNA profiling is considered a valid means of identification because each person (except identical twins) has a unique DNA sequence. The structure of DNA is a double - helix, composed of nucleotides which contain a sugar, a phosphate group, and a nitrogenous base. Genes are segments of DNA that carry the instructions for making proteins. Chromosomes are long strands of DNA tightly coiled around proteins. DNA is the genetic material that makes up genes and chromosomes, with genes being specific functional units within the DNA molecule and chromosomes being the organized structures that house DNA in the cell nucleus.