Definition

Noun: 1. A form of reproduction in which the sperm stimulates the egg to develop but does not contribute genetic material to the embryo. The embryo develops from an egg cell alone, containing only maternal chromosomes, because the sperm nucleus fails to fuse with the egg nucleus.

Usage

• Scientific Context: The term is used almost exclusively in biology, particularly in genetics, developmental biology, and the study of certain fish, amphibian, and plant species.
  • Researchers studied the mechanism of gynogenesis in the Amazon molly, an all-female fish species.
  • In this form of gynogenesis, the sperm is required to activate the egg's development but does not contribute paternal DNA.

Advanced Usage

• Distinction from Parthenogenesis: While a type of parthenogenesis, "gynogenesis" specifically implies the necessary presence of sperm to trigger embryonic development, unlike some forms of parthenogenesis where sperm is not involved at all.
  • The process is more accurately described as gynogenesis rather than parthenogenesis because mating with a male is required.

Variants and Related Words

• Gynogenetic (adjective): Relating to or characterized by gynogenesis.
  • The gynogenetic population consisted entirely of genetically identical females.

Synonyms

• Sperm-dependent parthenogenesis: A more descriptive synonym that highlights the role of the sperm.
• Pseudogamy: A broader term that can sometimes be used synonymously but may also refer to other processes where sperm is needed but does not fertilize.

Related Terms (Contextual)

• Androgenesis: The opposite process, where an embryo contains only paternal chromosomes.
• Parthenogenesis: The general term for reproduction from an egg without fertilization. Gynogenesis is a specific type of parthenogenesis.
• Cloning: A related concept, as gynogenesis produces offspring that are clones of the mother.

Noun

1. female parthenogenesis in which the embryo contains only maternal chromosomes due to the failure of the sperm to fuse with the egg nucleus