Facts about Genetics

1. 07

   Telomeres, protective caps of repetitive DNA sequences at chromosome ends, shorten by approximately 50 to 200 base pairs with each cell division, triggering senescence after roughly 50 to 70 divisions.

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2. 06

   Hemophilia B, a blood clotting disorder, results from mutations in the Factor IX gene located on the X chromosome, affecting approximately 1 in 25,000 males worldwide.

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3. 05

   Mitochondrial DNA, inherited exclusively from mothers in humans, mutates ten times faster than nuclear DNA due to exposure to reactive oxygen species during cellular respiration.

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4. 04

   CRISPR-Cas9 gene-editing technology, adapted from bacterial immune systems in 2012, can precisely cut and modify DNA sequences with 95 percent accuracy rates in laboratory settings.

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5. 03

   A single human cell contains roughly 3 meters of DNA coiled into a nucleus measuring only 10 micrometers across, achievable through hierarchical packaging with histone proteins.

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6. 02

   Identical twins share 100 percent of their DNA yet develop different traits due to epigenetic modifications that alter gene expression without changing the underlying genetic sequence.

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7. 01

   The human genome contains approximately 3.2 billion base pairs and 20,000 to 25,000 protein-coding genes distributed across 46 chromosomes.

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