EVERYDAY SCIENCE

Detailed explanation-1: -Since humans are thought to have about 100, 000 genes, a total of about 100 million nucleotide pairs of coding DNA must be present in the human genome. That this is only about 3 percent of the total size of the genome leads one to conclude that less than 5 percent of the human genome codes for proteins.

Detailed explanation-2: -The human genome In fact, we know the sequence of the entire human genome-all 3 billion letters. That’s enough information to fill roughly 1, 000 200-page books! Contained within the 3 billion letters of the human genome are about 21, 000 genes. Most of our known genes code for proteins, but some code for RNA molecules.

Detailed explanation-3: -One copy of the human genome consists of approximately 3 billion base pairs of DNA, which are distributed across 23 chromosomes. Human chromosomes range in size from about 50 million to 300 million base pairs.

Detailed explanation-4: -Most human cells contain 23 pairs of chromosomes. One set of chromosomes comes from the mother, while the other comes from the father.

Detailed explanation-5: -The human genome is the genome-all the DNA-of Homo sapiens. Humans have about 3 billion bases of information, divided into roughly 20, 000 to 22, 000 genes, which are spread among non-coding sequences and distributed among 24 distinct chromosomes (22 autosomes plus the X and Y sex chromosomes).