centromere

Trait

...mportant reference point along this string is the centromere ; the distance from a gene to the centromere is referred to as the gene's locus or map location. A chromosomal region known to control a trait ...

Mitosis

...NA element present on every chromosome called the centromere . A protein called cohesin acts as a glue joining two sister chromosomes (a.k.a. sister chromatids) along their lengths. When chromosomes are paired up and attached, each individual chromosome in the pair is called a chromatid , while the whole uni...

Prophase

...NA element present on every chromosome called the centromere . When chromosomes are paired up and attached, each individual chromosome in the pair is called a chromatid , while the whole unit (confusingly) is called a chromosome. Somewhat confusingly, when the chromatids separate, they are no longer called...

Mitotic spindle

...attach to the kinetochores that assemble on the centromere portion of the chromosomes and then pull the chromosomes into alignment along the center of the spindle. Once all the chromosomes are aligned with sister chromatids pointing to opposite ends of the spindle, the sister chromatids separate an...

Mitosis

...NA element present on every chromosome called the centromere . A protein called cohesin acts as a glue joining two sister chromosomes (a.k.a. sister chromatids) along their lengths. When chromosomes are paired up and attached, each individual chromosome in the pair is called a chromatid , while the whole uni...

Meiosis

...together and pair up. They have same lengths, same centromere positions and in most cases same number of genes a...ng up the bivalents along the equator so that each centromere is equidistant above and below the equator. The lining along the equator is random, maternal or pate...

Chromosomal crossover

...If they break and rejoin on opposite sides of the centromere , the result can be one chromosome being lost during cell division . If homologous chromosome are not perfectly aligned an unequal crossover may occur, an unequal crossover can create duplicate genes. Any pair of homologous chromosomes may be ex...

Chromosome

...ed in the cell's nucleus. Each chromosome has one centromere , with one or two arms projecting from the centrom...which is never expressed. It is located around the centromere and usually contains repetitive sequences. Facultative heterochromatin , which is sometimes expres...

Chromatid

...ister chromatids are joined at a point called the centromere . In non-gametic, non-dividing human cells, there are 23 pairs of chromosomes, thus 46 chromosomes. When it is ready to divide, each chromosome will replicate itself during the Synthesis phase within its life cycle. Chromosomes that have replicated s...

Chromatin

...(3) Condensed chromatin during interphase with centromere . (4) Condensed chromatin during prophase . (Two copies of the DNA molecule are now present) (5) Chromosome during metaphase . Two distinct types of chromatin can be distinguished: Euchromatin Heterochromatin Chromatin is the extended...

Centromere

The centromere is a region of a eukaryotic chromosome where ...py images of chromosomes. In most eukaryotes, the centromere has no defined DNA sequence . It typically consists of large arrays of repetitive DNA where the se...

Barr body

...ctivation centre or Xic , usually found near the centromere . The centre contains twelve genes, seven of which code for proteins , five for untranslated RNAs , of which only two are known to play an active role in the X inactivation process, Xist and Tsix. The centre also appears to be important in chro...