Grade 12
Life Sciences
0/9 Topics completed
Genetics
- 01DNA: the code of lifeDNA is the molecule that stores genetic instructions. Its shape is a double helix of nucleotides.
- 02MeiosisMeiosis is the division that makes gametes. It halves the chromosome number and shuffles the genes.
- 05Genetics and inheritanceGenetics is how alleles, versions of a gene, pass from parents to offspring and show up as traits.
Reproduction
Response
- 06Responding to the environment: humansHumans respond to the world through nerve impulses, which are fast, and hormones, which are slower and travel in the blood. Both are used to keep the inside of the body steady.
- 07Responding to the environment: plantsPlants respond to light, gravity and water by growing toward or away from the stimulus. The growth is controlled by hormones, especially auxin.
Evolution
- 08Evolution by natural selectionEvolution by natural selection is a change, over generations, in how common alleles are in a population, because some variants leave more offspring.
- 09Human evolutionHuman evolution is the long change, in Africa, from earlier hominins to modern humans. It is studied from fossils and from tools, not from a ladder of “improvement”.