Differbetween
The concept of symmetrical or asymmetrical karyotyping developed by Levitzky in 1931.
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Complete answer:
| SYMMETRIC KARYOTYPE | ASYMMETRIC KARYOTYPE |
|---|---|
| It is the same size. | It differs in size. |
| It has the median centromere. | The centromere positions are different. |
| Less scope of variation. | They have more scope for variation. |
- What is symmetrical karyotype?
- What is meant by an asymmetrical karyotype?
- What is bimodal karyotype?
- What is chromosome nor?
- What is an acrocentric chromosome?
- What is the centromeric index?
- What is nor in biology?
What is symmetrical karyotype?
A symmetrical karyotype is characterized by mainly median and submedian chromosomes of approxi- mately equal size. Changes to an asymmetric karyotype can occur by shifts in centromere position towards the telomere (Peruzzi et al. 2009).
What is meant by an asymmetrical karyotype?
A karyotype showing large differences between smallest and largest chromosome of the set and having fewer metacentric chromosomes, is called asymmetric karyotype, which is considered to be a relatively advanced feature when compared with symmetric karyotypes.
What is bimodal karyotype?
Bimodal Karyotype:
The term bimodal karyotype refers to an symmetrical karyotype that is composed of two distinct classes of chromosomes as determined from their size. Examples of such karyotypes are found in certain genera of Liliales, such as, Aloe, Gasteria, Yucca, Agave etc.
What is chromosome nor?
Nucleolar organizer regions (NORs) are chromosomal landmarks that consist of tandemly repeated sequences of ribosomal genes (rRNA). In eukaryotes, each unit is composed of three genes coding for 18S, 5.8S and 28S ribosomal RNA; these genes are separated by two intergenic spacers and an external transcribed spacer.
What is an acrocentric chromosome?
Acrocentric chromosome. A chromosome in which the centromere is very close to one end. For example, the centromere of chromosomes 13, 14, 15, 21, and 22 is very close to the p telomere, making the p arm very short.
What is the centromeric index?
Centromere index (Cl) is traditionally defined as the length of the short arm divided by the total length of the chromo some X100. It has been a valuable quan titative measure for describing the shape of the chromosome, especially before the chromosome banding era.
What is nor in biology?
Nucleolar organizer region or NOR is a region in the chromosome around which the nucleolus forms. It contains genes for ribosomal RNA. Treating chromosomes with silver nitrate solution selectively stain the NORs.
