Biology: Age 17

6 illustrated Biology lessons for Age 17.

How meiosis shuffles genes In meiosis, one cell divides twice to make four sex cells, each with half the chromosomes. Before dividing, ma…
Our branching family tree Palaeoanthropologists rebuild human origins from fossils such as skulls and bones. These finds show that homin…
The BMI dip and the early rebound After a child's first year, body mass index (BMI) normally falls, reaches a lowest point around age 5 to 7, th…
Crossing Over in Prophase I During prophase I of meiosis, paired homologous chromosomes lie close together. At one point, a non-sister chr…
Bacteria Inside Cells Mitochondria and chloroplasts are organelles in eukaryotic cells that carry their own circular DNA and a doubl…
How a Nerve Signal Travels A neuron collects incoming signals through its branches, then fires one electrical pulse down its long fibre. …