Definition

1. Adjective:
   • Relating to sexual reproduction involving dissimilar gametes: Describes a biological process where the two fusing sex cells (gametes) differ in form, typically in size and/or structure. This is the most common form of sexual reproduction in multicellular organisms.

Usage and Examples

• Adjective:
  • Most animals and many plants are anisogamous, producing large, immobile egg cells and small, motile sperm cells.
  • The evolution of anisogamous reproduction is a key step in the development of complex multicellular life.
  • In anisogamous species, the difference in gamete size is often linked to differences in parental investment.

Advanced Usage

• Anisogamy as a spectrum: The term can describe not just a binary state but a spectrum of gamete size difference, from slight to extreme.
  • The study examined the degree of anisogamous differentiation across various algal species.

Variants and Related Words

• Anisogamy (noun): The condition or process of having dissimilar gametes.
  • Anisogamy is considered an evolutionary innovation.
• Isogamous (adjective): The opposite state, relating to sexual reproduction involving morphologically similar gametes.
  • Some fungi and algae are isogamous.

Synonyms

• Heterogamous (in a specific biological context referring to gamete difference)
• Oogamous (a specific, extreme form of anisogamy where one gamete is very large and non-motile)

Antonyms

• Isogamous

Adjective

1. relating to a type of sexual reproduction in which the gametes are dissimilar in some respect (as size or shape)