dimorphism

(noun)

the occurrence in an animal species of two distinct types of individual

Related Terms

  • adaptive radiation

Examples of dimorphism in the following topics:

  • Sexual Selection

    • These differences are called sexual dimorphisms and arise from the variation in male reproductive success.
    • Sexual dimorphism varies widely among species; some species are even sex-role reversed.
    • Discuss the effects of sexual dimorphism on the reproductive potential of an organism
  • Hypothalamus

    • The defeated animal has an increase in Fos levels in sexually dimorphic structures.
    • Several hypothalamic nuclei are sexually dimorphic, i.e. there are clear differences in both structure and function between males and females.
    • Some differences are apparent even in gross neuroanatomy: most notable is the sexually dimorphic nucleus within the preoptic area.
  • Phylum Rotifera

    • Rotifers are dioecious organisms (having either male or female genitalia) and exhibit sexual dimorphism (males and females have different forms).
  • Micturition and the Micturition Reflex

    • Due to sexual dimorphism, and the positions where the urethra ends, males and females often use different techniques for urination.
  • Normal Gastrointestinal Microbiota

    • Candida albicans, a dimorphic fungus that grows as a yeast in the gut.
  • Fungi as Plant, Animal, and Human Pathogens

    • Histoplasmosis is caused by the dimorphic fungus Histoplasma capsulatum.
  • Phylum Nemertea

    • Animals in phylum Nemertea show sexual dimorphism, although freshwater species may be hermaphroditic.
  • Phylum Echinodermata

    • Echinoderms are sexually dimorphic and release their eggs and sperm cells into water; fertilization is external.
  • Early Hominins

    • For example, sexual dimorphism was more exaggerated than in modern humans.
  • Characteristics and Evolution of Primates

    • The very arboreal gibbons are smaller than the great apes; they have low sexual dimorphism (that is, the genders are not markedly different in size); and they have relatively longer arms used for swinging/brachiating through trees.
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