Sites that are not unique. 1  Aggregators/ collections. 2  Something everyone on the internet already knows about (e.g., Netflix, Khan Academy, etc.) 3  Something not unique (includes generators, blogs, tumblrs, etc.) 4  Web games. Post to /r/webgames instead.  Articles or videos.
For example, cells in the human body have 46 chromosomes in total (this includes two sex chromosomes; XX for women and XY for men). However, human sperm and egg cells produced through meiosis only have 23 chromosomes. âMeiosis is reductional,â said M. Andrew Hoyt, a professor of biology at Johns Hopkins University. Meiosis produces daughter cells that have half the number of chromosomes as the parent cell. Thus, when fertilization occurs, the chromosome number is restored. For example, when the human sperm and egg combine during fertilization, they produce a zygote, a cell with 46 chromosomes.
Unit 2 - Making Gametes (H) Cell division is one of the processes studied in GCSE Biology. This quiz focuses on one particular type, meiosis, which is used in the making of gametes. Gametes are the female and male sex cells - eggs and sperm. The gametes are made in the ovary and testes by a special type of reduction cell division called meiosis. Normal body cells contain 23 paired chromosomes giving a total of 46. Gametes only have one copy of each chromosome so instead of 46 they only have 23.