germ plasm

Thân thiện

A scientist carefully examines a sample of germ plasm under a laboratory microscope.

Definition

1. Noun:
   • The hereditary material of germ cells: "Germ plasm" refers specifically to the protoplasm within reproductive cells (germ cells) that carries the chromosomes and genes responsible for transmitting hereditary characteristics from one generation to the next.

Usage

• The term "germ plasm" is used primarily in the fields of biology, genetics, and heredity to discuss the material basis of inheritance.
• It is a specialized term, often encountered in academic or scientific contexts rather than everyday conversation.

Examples

• Noun:
  • The theory of the continuity of the germ plasm was a foundational concept in early genetics.
  • Scientists study the germ plasm to understand how traits are passed to offspring.
  • Mutations in the germ plasm can be inherited by future generations.

Advanced Usage

• "Germ plasm theory": A historical biological theory proposing that an organism's cells are divided into somatic cells (the body) and germ cells (reproductive material), and that only changes to the germ plasm are heritable.
  • August Weismann's germ plasm theory distinguished between heritable and non-heritable cellular changes.

Variants and Related Words

• Germ cell (n): A reproductive cell (sperm or egg) that contains the germ plasm.
• Plasma (n): In biology, the colorless fluid part of blood or lymph; distinct from "plasm" which refers to protoplasm or living material.
• Protoplasm (n): The living content of a cell, including the germ plasm.

Synonyms

• Hereditary material: A more general term for substances like DNA that carry genetic information.
• Genetic material: Material (e.g., DNA, RNA) that carries genetic information.

Notes on Meaning

• The term is specific and technical. It does not refer to:
  • A general substance or "plasma" in the physics sense (ionized gas).
  • The cytoplasm of any cell; it is specific to reproductive cells.
  • A pathogen or "germ" in the sense of a disease-causing microorganism.

Học thuật

Noun

1. the protoplasm of the germ cells that contains chromosomes and genes

Từ đồng nghĩa

• plasm