heteroploid
Definition
Noun (Genetics): An organism or cell whose total number of chromosomes is not an exact multiple of the haploid number (n) characteristic for its species. This results in an unbalanced chromosome complement, such as in aneuploidy (e.g., trisomy, monosomy).
Usage
The term is used in genetics and cytology to describe cells or organisms with an irregular chromosome number that deviates from the normal euploid state (e.g., diploid 2n, tetraploid 4n).
Examples
- The researcher identified the abnormal cell as a heteroploid due to its irregular chromosome count.
- Heteroploid conditions, such as Down syndrome (trisomy 21), often arise from errors in cell division.
- The study compared the growth rates of euploid and heteroploid plant tissues.
Advanced Usage
- The term is often used in a technical, diagnostic, or research context. In many specific cases, more precise terms like aneuploid (where the number is not an exact multiple of n) are preferred.
- Heteroploidy (noun) is the state or condition of being heteroploid.
- The heteroploidy observed in the tumor sample suggested genomic instability.
Variants and Related Words
- Heteroploidy (n): The condition of having a heteroploid chromosome number.
- Aneuploid (adj/n): A common type of heteroploid where the chromosome number is not an exact multiple of the haploid set due to extra or missing individual chromosomes.
- Euploid (adj/n): Having a chromosome number that is an exact multiple of the haploid number (e.g., diploid, triploid). This is the antonymous state.
- Polyploid (adj/n): Having more than two complete sets of chromosomes (e.g., triploid 3n, tetraploid 4n). Polyploids are a type of euploid, not heteroploid.
Synonyms
- Aneuploid (in most common usage, though "heteroploid" is a broader category)
- Chromosomally abnormal
- Chromosomally irregular
Antonyms
- Euploid
- Diploid (for a species where 2n is the normal state)
Noun
- (genetics) an organism or cell having a chromosome number that is not an even multiple of the haploid chromosome number for that species
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