Double helix discovery, genetic sequencing, chromosomes, and heredity.
Test your knowledge with these top questions!
Which pair of scientists is credited with describing DNA's double helix structure?
Watson and Crick built their 1953 DNA model from Rosalind Franklin's X-ray diffraction images.
Which molecule carries the hereditary instructions parents pass to offspring?
DNA packages genes that shape traits, and offspring inherit roughly half from each parent.
Which technique reveals the exact order of nucleotide bases along a DNA molecule?
DNA sequencing reads the As, Ts, Gs, and Cs of a genome, powering everything from ancestry tests to cancer research.
How many chromosomes are in a typical human somatic cell nucleus?
Most nucleated human somatic cells have 46 chromosomes in 23 pairs; mature red blood cells lack nuclei and gametes have 23.