Centromere in Biological Definition

Centromere

... The centromere is a region of a eukaryotic chromosome where ... images of chromosomes. In most eukaryotes, the centromere has no defined DNA sequence . It typically ... inheritance plays a major role in specifying the centromere in most organisms. The daughter chromosomes will ...

Chromosome

... parts of the chromosome after S phase . (2) centromere . The point where the two chromatids touch, and ... in the cell's nucleus. Each chromosome has one centromere , with one or two arms projecting from the ... is never expressed. It is located around the centromere and usually contains repetitive sequences. ...

Meiosis

... gamete nuclei come together and pair up. They have same lengths, same centromere positions and in most cases same number of genes arranged in linear order. ... centromeres , lining up the bivalents along the equator so that each centromere is equidistant above and below the equator. The lining along the equator ...

Trait

... a chromosome . An important 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 ...

Barr body

... (Y or W). Mechanism Mammalian X-chromosome inactivation is initiated from the X inactivation 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 ...

Chromatin

... of DNA condensation. (1) Single DNA strand. (2) Chromatin strand ( DNA with histones ). (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 ...

Chromatid

... After they have been pulled apart by the mitotic spindle , chromatids are called "chromosomes". Sister 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 ...

Chromosomal crossover

... the result can be a duplication of genes on one chromosome and a deletion of these on the other. 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 ...

Mitosis

... in the cell. Identical chromosomes (called sister chromosomes) are attached to each other at a DNA 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 ...

Mitotic spindle

... spindle is formed by the centrosomes as they move apart. Some of the spindle's microtubules 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 ...

Prophase

... in the cell. Identical chromosomes (called sister chromosomes) are attached to each other at a DNA 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) ...

Mitosis

... in the cell. Identical chromosomes (called sister chromosomes) are attached to each other at a DNA 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 ...