Fleets of tiny translucent umbrellas, each about the size of a lentil, waft through the waters of the Mediterranean Sea. These miniature jellyfish, known as Turritopsis dohrnii, wave and grasp with their pale tentacles, bringing plankton to their mouths, as do many other jellyfish species adrift in the glowing water. But they have a secret […]
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Among various things that unite humans around the world, the DNA sequence hovers at the top: a whopping 99.9% of human DNA sequences are identical among people. Gregor Mendel, a monk and scientist whose 200th birthday is this Wednesday (July 20), proposed that certain “invisible factors” were responsible for the various characteristics we display. Today, […]
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Most mammals, including humans, are diploid. That is, nuclear DNA (nrDNA) exists as pairs of chromosomes (humans have 23 pairs of chromosomes, while mice have 20). This pair of chromosomes are homologous, in that the sequence of genes on both the chromosomes is the same. However, a gene that sits on a particular address (‘locus’) […]
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