Definition

Noun A gamete (a mature reproductive cell) that differs in size, structure, or activity from the gamete it unites with during fertilization, especially one of a pair where the cells are visibly different in size.

Usage

The term is used in biology, specifically in the study of reproduction, to describe one of two dissimilar reproductive cells that fuse to form a zygote. It is the opposite of an isogamete.

Examples

• In many algae and fungi, reproduction involves the fusion of a large, non-motile anisogamete (the egg) and a small, motile anisogamete (the sperm).
• The evolution of anisogametes is considered a major step in sexual reproduction, leading to the specialization of male and female gametes.
• The species exhibits anisogamy, meaning it produces two distinct types of anisogametes.

Advanced Usage

• The concept is central to discussions on the evolution of sex and gamete specialization. The larger anisogamete (macrogamete) typically provides more resources for the zygote, while the smaller one (microgamete) is often more mobile.

Variants and Related Words

• Anisogamy (n): The condition of having dissimilar gametes, typically differing in size. (e.g., )
• Isogamete (n): A gamete that is similar in size and form to the one it fuses with. (This is the direct antonym.)
• Gamete (n): The general term for a mature haploid reproductive cell.

Synonyms

• Heterogamete (This is a very close synonym, though sometimes used with a slightly broader meaning encompassing differences beyond just size.)

Notes on Meaning

This word has a single, precise biological meaning. It does not have idioms, phrasal verbs, or different common meanings outside its technical context.

Noun

1. either of a pair of unlike gametes especially those unlike in size