Click to edit Master text styles
Second level
Third level
Fourth level
Fifth level
A mousetrap is composed of five integral parts; the platform to which everything is attached, the hammer which does the dirty work, the spring which provides the force, the holding bar to keep the hammer in tension, and finally the catch to keep the holding bar in tenuous position. Remove any one of these parts and the mousetrap is not just less efficient, it cease to function at all. All five parts are necessary. You can’t build a mousetrap by natural selection by adding one piece at a time because it has no function to select until all five parts are together.
There are at least 10 types of human satellite DNA.  Typically they make up 10 - 15 % of  mammals genomes.  It is satelite DNA that is used in one type of DNA finger printing.
Short Interspersed Elements (SINEs) - These approximately 300 bp units of DNA  are found distributed throughout the genome.  An example is the human  Alu sequence which occurs about 500,000 times making up 5 % of the genome in the human genome.  One of the interesting properties of SINEs is that they  may move about in the genome.
Long Interspersed Elements (LINEs) - are longer than SINEs (up to 7,000 bp).  There are approximately 50,000 copies of the most common LINE family, L1, so this group makes up 5 % of the human genome.
Pseudogenes usually have mutations that would produce stop codons within what would normally be the coding region, thus only fragments of the protein they seem to code for would be produced if they were expressed.  It is not known if pseudogenes are expressed in any way.