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  2. Reproductive biology - Wikipedia

    en.wikipedia.org/wiki/Reproductive_biology

    Animal reproduction occurs by two modes of action, including both sexual and asexual reproduction. [1] In asexual reproduction the generation of new organisms does not require the fusion sperm with an egg. [1] However, in sexual reproduction new organisms are formed by the fusion of haploid sperm and eggs resulting in what is known as the ...

  3. Reproduction - Wikipedia

    en.wikipedia.org/wiki/Reproduction

    Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parent" or parents. There are two forms of reproduction: asexual and sexual. In asexual reproduction, an organism can reproduce without the involvement of another organism.

  4. Human reproduction - Wikipedia

    en.wikipedia.org/wiki/Human_reproduction

    Human sexual reproduction, to produce offspring, begins with fertilization. Successful reproduction typically involves sexual intercourse between a healthy, sexually mature and fertile male and female. [1] During sexual intercourse, sperm cells are ejaculated into the vagina through the penis, resulting in fertilization of an ovum to form a ...

  5. Modes of reproduction - Wikipedia

    en.wikipedia.org/wiki/Modes_of_reproduction

    The three traditional modes of reproduction are: [1] Oviparity, taken to be the ancestral condition, where either unfertilised oocytes or fertilised eggs are spawned. [1] Viviparity, including any mechanism where young are born live, or where the development of the young is supported by either parent in or on any part of their body. [1]

  6. Asexual reproduction - Wikipedia

    en.wikipedia.org/wiki/Asexual_reproduction

    Asexual reproduction is the primary form of reproduction for single-celled organisms such as archaea and bacteria. Many eukaryotic organisms including plants , animals , and fungi can also reproduce asexually. [ 1 ]

  7. Semelparity and iteroparity - Wikipedia

    en.wikipedia.org/wiki/Semelparity_and_iteroparity

    [1] Semelparity and iteroparity are not, strictly speaking, alternative strategies, but extremes along a continuum of possible modes of reproduction. Many organisms considered to be semelparous can, under certain conditions, separate their single bout of reproduction into two or more episodes. [2] [3]

  8. Reproductive system - Wikipedia

    en.wikipedia.org/wiki/Reproductive_system

    The reproductive system of an organism, also known as the genital system, is the biological system made up of all the anatomical organs involved in sexual reproduction. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system. [1]

  9. Key Stage 3 - Wikipedia

    en.wikipedia.org/wiki/Key_Stage_3

    Key Stage 3 (commonly abbreviated as KS3) is the legal term for the three years of schooling in maintained schools in England and Wales normally known as Year 7, Year 8 and Year 9, when pupils are aged between 11 and 14. In Northern Ireland the term also refers to the first three years of secondary education.

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