Question

A) LINES and SINES are longer sequences and they do not repeat in tandem. Why are they called repetitive? (Be sure you understand what they words in tandem mean.)

B) Together LINES and SINES make up what percent of the DNA of the human genome?

C) Let's conclude with an interesting fun fact... the human genome has about 20,000 functional genes. This DNA sequence only accounts for what percent of the entire human genome?

Answer 1

A) long interespersed nucelar elements and short interspersed nucelar elements are retrotransposons that copy it's sequence and insert inside the genome through a RNA intermediate. Eventhough the repetitive sequences or copies are not located one behind one, the sequence is copied exactly and will be inserted in the genome. Since the same sequence is copied over and over and present in the genome , they are repetitive sequences

B)33.4 percentage of human genome were found to be occupied by LINES/ SINES

C) human genome is more than 3 billion base pairs and has only 20000 approximate functional genes which means only 1 to 2 percentage are functional