Definition

1. Noun (Biology, Genetics):
   • The pairing of homologous chromosomes: "Synapsis" refers specifically to the precise side-by-side alignment and physical connection of matching (homologous) chromosomes, one inherited from the mother and one from the father. This process is a critical and defining event at the beginning of meiosis, the cell division that produces gametes (sperm and eggs).

Usage Examples

• Noun:
  • Synapsis is essential for genetic recombination during meiosis.
  • The failure of synapsis can lead to errors in chromosome segregation.
  • During prophase I, homologous chromosomes undergo synapsis.

Advanced Usage

• "To undergo synapsis": describes the action of chromosomes coming together in this specific pairing.
  • The homologous chromosomes must undergo synapsis correctly to ensure proper genetic exchange.

Variants and Related Words

• Synapse (n): A completely different term in neuroscience referring to the junction between two nerve cells. Do not confuse with "synapsis."
• Synaptic (adj): Pertaining to synapsis (in genetics) or to a synapse (in neurology). Context is key.
  • The synaptic complex facilitates genetic exchange. (Genetics context)
• Synaptonemal complex (n): The protein structure that forms between homologous chromosomes during synapsis, facilitating their alignment and recombination.

Synonyms

• Chromosome pairing: A more general descriptive term for the event.
• Conjugation (in a specific genetic context): Sometimes used to describe the pairing process, though more common in bacteriology.

Related Phrases/Concepts

• Crossing over: The exchange of genetic material that occurs between homologous chromosomes they have undergone synapsis.
• Bivalent: The structure formed by a pair of homologous chromosomes that have undergone synapsis.
• Meiotic prophase I: The specific stage of cell division where synapsis occurs.

Noun

1. the side by side pairing of homologous maternal and paternal chromosomes at the start of meiosis