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tag hearing loss evolution

Chromosome 21 Reveals Sparse Gene Content
Ricki Lewis | Jun 11, 2000 | 8 min read
The unveiling of the DNA sequences of human chromosomes represents a new chapter in the unfolding story of genomics, but one with roots in the half-century-old field of cytogenetics. Chromosome-level looks can reveal the specific genes behind certain traits and disorders while providing information on genome organization. The diminutive chromosome 21--the smallest of the human contingent, despite its number as next to last--is the fourth to be described. Its debut in mid-May attracted attentio
Genome Economy
Ricki Lewis | Jun 10, 2001 | 10 min read
The Human Genome Project's discovery1 that the human body runs on an instruction manual of a mere 35,000 or so genes--compared to the worm's 19,000, the fruit fly's 13,000, and the tiny mustard relative Arabidopsis thaliana's 25,000--placed humanity on an even playing field with these other, supposedly simpler, organisms. It was a humbling experience, but humility quickly gave way to awe with the realization that the human genome might encode 100,000 to 200,000 proteins. Scientists base this num

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