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  2. List of organisms by chromosome count - Wikipedia

    en.wikipedia.org/wiki/List_of_organisms_by...

    The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.

  3. Animal cognition - Wikipedia

    en.wikipedia.org/wiki/Animal_cognition

    The study of animal conditioning and learning used in this field was developed from comparative psychology. It has also been strongly influenced by research in ethology , behavioral ecology , and evolutionary psychology ; the alternative name cognitive ethology is sometimes used.

  4. Sex-limited genes - Wikipedia

    en.wikipedia.org/wiki/Sex-limited_genes

    The X chromosome makes a very small percentage of the total human genome and the epigenetics of this chromosome is a major contributor to certain diseases. Thus sex-limited epigenetic traits may have played a pivotal role in the evolution of mammals and other species, particularly as a mechanism to ameliorate intralocus conflict between the sexes.

  5. Sexual dimorphism - Wikipedia

    en.wikipedia.org/wiki/Sexual_dimorphism

    Sexual dimorphism was also described in the gene level and shown to extend from the sex chromosomes. Overall, about 6500 genes have been found to have sex-differential expression in at least one tissue. Many of these genes are not directly associated with reproduction, but rather linked to more general biological features.

  6. XO sex-determination system - Wikipedia

    en.wikipedia.org/wiki/XO_sex-determination_system

    The letter O (sometimes a zero) signifies the lack of a Y chromosome. [1] Maternal gametes always contain an X chromosome, so the sex of the animals' offspring depends on whether a sex chromosome is present in the male gamete. Its sperm normally contains either one X chromosome or no sex chromosomes at all.

  7. Primate cognition - Wikipedia

    en.wikipedia.org/wiki/Primate_cognition

    The chimpanzee Böbe painting in 1967. Primate cognition is the study of the intellectual and behavioral skills of non-human primates, particularly in the fields of psychology, behavioral biology, primatology, and anthropology.

  8. Chromosome - Wikipedia

    en.wikipedia.org/wiki/Chromosome

    This is an accepted version of this page This is the latest accepted revision, reviewed on 8 December 2024. DNA molecule containing genetic material of a cell This article is about the DNA molecule. For the genetic algorithm, see Chromosome (genetic algorithm). Chromosome (10 7 - 10 10 bp) DNA Gene (10 3 - 10 6 bp) Function A chromosome and its packaged long strand of DNA unraveled. The DNA's ...

  9. Polysomy - Wikipedia

    en.wikipedia.org/wiki/Polysomy

    Trisomy 21 – Down syndrome, an example of a polysomy at chromosome 21. Polysomy is a condition found in many species, including fungi, plants, insects, and mammals, in which an organism has at least one more chromosome than normal, i.e., there may be three or more copies of the chromosome rather than the expected two copies. [1]