Biology: Age 18

6 illustrated Biology lessons for Age 18.

Crossing-over between homologous chromosomes During meiosis, two homologous chromosomes pair up, and a chromatid from each one crosses the other and swaps …
Chromosome Shuffling in Gametes During meiosis, each pair of chromosomes lines up and separates on its own, so the two copies can end up in an…
Knee Jerk Stretch Reflex A tap on the tendon below the kneecap stretches the quadriceps and its muscle spindles. The spindle sends a si…
Molecular patches skip a faulty gene segment Molecular patches are short molecules that bind to a gene transcript near a faulty segment. The cell's splicin…
Waking a Dormant Photoreceptor In some forms of blindness, photoreceptor cells stay in the retina but no longer respond to light. Gene therap…
Energy Pyramid of a Meadow An energy pyramid stacks the feeding levels of an ecosystem, with plants that capture sunlight forming the wid…