Definition

Noun: A chromosome with a terminal centromere, appearing as a straight rod-shaped structure during cell division. The centromere is positioned at one end, meaning the chromosome has a single arm.

Usage

This is a specialized term used in genetics and cytology to describe a specific chromosome morphology. It is typically used in academic, scientific, and educational contexts. * In this type of chromosome, the centromere is located at the very end. * The karyotype analysis revealed the presence of a telocentric chromosome.

Examples

• Under the microscope, the telocentric chromosome was easily identifiable by its straight, rod-like shape.
• Researchers studied the inheritance pattern of a gene located on the telocentric chromosome.
• The presence of a telocentric chromosome in the species is a result of a specific evolutionary rearrangement.

Advanced Usage

• Comparative Cytogenetics: Telocentric chromosomes are often discussed in comparisons between species, as their presence or absence can be a key cytogenetic feature.
  • The shift from metacentric to telocentric chromosomes in some rodent lineages is a well-documented evolutionary event.

Variants and Related Words

• Telocentric (Adjective): Describing the state or property of having a terminal centromere.
  • The researcher identified a telocentric structure in the cell sample.
• Centromere (Noun): The specialized region of a chromosome to which microtubules attach during cell division.
• Metacentric chromosome (Noun): A chromosome with a centromere in the middle, forming two arms of equal length.
• Acrocentric chromosome (Noun): A chromosome with the centromere near one end, resulting in one very long arm and one very short arm.

Synonyms

• Terminal centromere chromosome (descriptive synonym, less common)

Notes on Meaning

This term refers strictly to a structural classification of chromosomes based on centromere position. It does not describe gene content, function, or specific species. True telocentric chromosomes, with the centromere precisely at the terminus, are rare in many organisms, including humans; what are often called "telocentric" may technically be acrocentric with a very short arm.

Noun

1. a chromosome like a straight rod with the centromere in terminal position