identical twin
Học thuậtThân thiện
Definition
Noun: A type of twin sibling pair that originates from a single fertilized egg (zygote) that splits into two embryos early in development. As a result, identical twins share virtually the same genetic material and are always of the same sex.
Usage
The term "identical twin" is used to describe one member of such a pair or to refer to the biological relationship itself. It is a specific scientific and common term within the broader category of "twins."
Examples
- As a noun (subject/object):
- Sarah is an identical twin; she and her sister look exactly alike.
- The study focused on identical twins to understand the influence of genetics versus environment.
- Describing the relationship:
- They have an identical twin bond that is incredibly strong.
Advanced Usage
- Scientific/Medical Context: The formal term is monozygotic twin. "Identical twin" is the common term, while "monozygotic" is used in technical writing.
- The researchers recruited pairs of monozygotic (identical) twins for their study.
- "Identical twin" as a modifier: It can function adjectivally before another noun.
- They participated in an identical twin study.
Variants and Related Words
- Monozygotic twin (n): The technical, scientific synonym for "identical twin."
- Fraternal twin (n): The contrasting term for twins that develop from two separate fertilized eggs (dizygotic twins). They are not genetically identical.
- Twin (n): The general term for one of two offspring born from the same pregnancy.
Synonyms
- Monozygotic twin (formal)
Notes on Meaning
- The term specifically denotes genetic identity, not just physical similarity. While identical twins often look very similar, environmental factors can lead to differences in appearance, personality, and health.
- It is a compound noun. The word "identical" in this phrase cannot be separated from "twin" without changing the specific meaning.
Noun
- either of two twins developed from the same fertilized ovum (having the same genetic material)