AP BIOLOGY

THE MOLECULAR BASIS OF INHERITANCE

TRANSPOSONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
-What percentage approximately of the ETs constitute in the human genome?
A
From 48 to 51 %
B
From 48 to 50 %
C
From 50 to 60 %
D
between 47 and 48
Explanation: 

Detailed explanation-1: -In the 1960s DNA reannealing studies uncovered that eukaryotic genomes contain a highly variable fraction of repetitive DNA. Since the sequencing of complex genomes these observations have been made precise: approximately 50% of the human genome is made up of repetitive sequences [8].

Detailed explanation-2: -In humans, only about 2% of the genome encodes proteins. Much-but not all-of the remaining 98% is evolutionary detritus. In the 1960s, researchers learned that non-coding DNA can serve vital functions, such as regulating gene action and building ribosomes. The remainder they began to call junk.

Detailed explanation-3: -Only about 1 percent of DNA is made up of protein-coding genes; the other 99 percent is noncoding.

Detailed explanation-4: -Since the exome occupies only about 1% of the genome, the size of an exome is roughly 30 million nucleotides; thus, approximately 99% of the human genome does not code for a protein. However, these regions by and large have biological functions that might affect gene expression and likely the clinical phenotypes.

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