Meiosis: Source of Genetic Variation Meiosis gives rise to cells that are genetically different from each other and is the type of cell division used to produce gametes (sex cells) During meiosis, ...
Locations of Genes on a Chromosome Every chromosome consists of a long DNA molecule that contains several hundred or even thousands of different genes coding for different proteins A length of DNA ...
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 ...
2023香港AP报名截止时间延长，新增考位名额今日起报名！香港AP考场一直是大陆社会考生的首选项，所以10月香港开放报名后很快满额，中间增加过一次名额，但似乎依旧供不应求。 重点如下： 1、报名时间：11月9日上...
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 ...
