Fertilisation in Mammals During sexual intercourse, semen is ejaculated high up into the?vagina?of the female,?near the cervix The sperm cells then follow a?chemical trail released by the egg cell?...
Mammalian Gametes Gametes Gametes are the?sex cells?of an organism For example, the?sperm?and?egg?(ovum) cells in humans Gametes fuse during fertilisation to form a?zygote Fertilisation is the?fusi...
Pracitical: Identifying Mitosis in Plant Cells Growth in plants occurs in specific regions called?meristems The root tip meristem can be used to study?mitosis The root tip meristem can be found?jus...
The Stages of Mitosis Mitosis is the process of nuclear division by which?two genetically identical daughter nuclei?are produced that are also genetically identical to the parent cell nucleus (they...
The Cell Cycle Mitosis?is part of a?precisely controlled process?known as the?cell cycle The cell cycle is the?regulated sequence of events?that occurs?between one cell division and the next The ce...
Recognising Organelles from Electron Microscope Images Electron microscopes can produce highly detailed images of animal and plant cells This is because they have a higher?resolution, or?resolving ...
Magnification & Measuring Size Magnification?is?how many times bigger?the image of a specimen observed is in comparison to the actual, real-life size of the specimen A?light microscope?has two ...
Using a Microscope Many biological structures are too small to be seen by the naked eye Optical microscopes?are an invaluable tool for scientists as they allow for tissues, cells and organelles to ...
Organisation of Cells Cell theory states that cells are the basic functional unit of all living organisms Cells can become?specialised?for?specific functions,?e.g. Epithelial cells in the small int...
