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  2. Animal echolocation - Wikipedia

    en.wikipedia.org/wiki/Animal_echolocation

    Echolocating bats use echolocation to navigate and forage, often in total darkness. They generally emerge from their roosts in caves, attics, or trees at dusk and hunt for insects into the night. Using echolocation, bats can determine how far away an object is, the object's size, shape and density, and the direction (if any) that an object is ...

  3. XO sex-determination system - Wikipedia

    en.wikipedia.org/wiki/XO_sex-determination_system

    The XO sex-determination system (sometimes referred to as X0 sex-determination system) is a system that some species of insects, arachnids, and mammals use to determine the sex of offspring. In this system, there is only one sex chromosome, referred to as X. Males only have one X chromosome (XO), while females have two (XX).

  4. Sex-determination system - Wikipedia

    en.wikipedia.org/wiki/Sex-determination_system

    Because the use of ZW sex determination is varied, it is still unknown how exactly most species determine their sex. [22] However, reportedly, the silkworm Bombyx mori uses a single female-specific piRNA as the primary determiner of sex. [25] Despite the similarities between the ZW and XY systems, these sex chromosomes evolved separately.

  5. XY sex-determination system - Wikipedia

    en.wikipedia.org/wiki/XY_sex-determination_system

    Males typically have two different kinds of sex chromosomes (XY), and are called the heterogametic sex. [1] In humans, the presence of the Y chromosome is responsible for triggering male development; in the absence of the Y chromosome, the fetus will undergo female development.

  6. Determination of sex - Wikipedia

    en.wikipedia.org/wiki/Determination_of_sex

    [6] [7] The term "sex determination" increased in usage after 1900. [8] In the 1960 and early 70's the term "sex assignment" came into prominent use as a colloquially word for "determination of sex" and "sex determination". "Sex assignment" did not occur in writing prior to the 1960's. It is used ~100 times less frequently than "determination ...

  7. ZW sex-determination system - Wikipedia

    en.wikipedia.org/wiki/ZW_sex-determination_system

    The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons.

  8. Temperature-dependent sex determination - Wikipedia

    en.wikipedia.org/wiki/Temperature-dependent_sex...

    Temperature-dependent sex determination (TSD) is a type of environmental sex determination in which the temperatures experienced during embryonic/larval development determine the sex of the offspring. [1] It is observed in reptiles and teleost fish, with some reports of it occurring in species of shrimp.

  9. Environmental sex determination - Wikipedia

    en.wikipedia.org/wiki/Environmental_sex...

    The sex of the green spoonworm, Bonellia viridis, a marine annelid, depends on where the larvae make landfall (female shown). Environmental sex determination is the establishment of sex by a non-genetic cue, such as nutrient availability, experienced within a discrete period after fertilization. [1]