南美鸟类中Z染色体的比较染色体分析显示,染色体内重组的高率

Marie Rosellynn C Enguito1,2, Analía Del Valle Garnero3, Ricardo José Gunski3

  • 1School of Natural Sciences, University of Kent, Canterbury CT2 7NJ, UK.

Genes
|January 28, 2026
PubMed
概括

鸟类Z染色体的进化表明,物种间的重组率很高,保留了与蛇染色体相同的序列. 这项研究绘制了南美鸟类的Z染色体变化图,揭示了对性染色体动态的新见解.

相关概念视频

Chromosome Structure02:40

Chromosome Structure

A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
26.3K
Chromosome Structure02:40

Chromosome Structure

6.2K
Polytene Chromosomes02:04

Polytene Chromosomes

Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
11.0K
Polytene Chromosomes02:04

Polytene Chromosomes

3.5K
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops...
8.7K
Lampbrush Chromosomes01:51

Lampbrush Chromosomes

2.9K