What is chromomere in biology?
Definition of chromomere : one of the small bead-shaped and heavily staining masses of coiled chromatin that are linearly arranged along the chromosome.
Is chromomere and centromere same?
The main difference between centromere and chromomere is that the centromere is the condensed part of the chromosome, which links the two sister chromatids whereas the chromomere is linearly arranged chromatin granules along the length of the chromosomes.
What is chromonema made of?
Chromonema is a spirally coiled, fiber-like structure in the central filament that is the primary form of chromosome condensation. Each chromonema consists of microfibrils that are made up of a single molecule of DNA, that is embedded in the matrix of chromosomes.
How long do telomeres last?
But it dissipates and is gone within about 48 hours. After that time, the newly lengthened telomeres begin to progressively shorten again with each cell division.
What is the telomere problem?
Abstract. Telomeres are complex nucleoprotein structures that protect the extremities of linear chromosomes. Telomere replication is a major challenge because many obstacles to the progression of the replication fork are concentrated at the ends of the chromosomes. This is known as the telomere replication problem.
What is Boke stage?
∙Leptotene stage is the first step of meiotic division-I,which is also known as bouquet stage ,chromosome become gradually visible ,nuclear membrane initiates to disappear.
What is Dictyate state?
The dictyate or dictyotene is a prolonged resting phase in oogenesis. It occurs in the stage of meiotic prophase I in ootidogenesis. It starts late in fetal life and is terminated shortly before ovulation by the LH surge.
What is the chromomere?
The chromomere is an organization of regions of non-transcribed chromatin. These regions of chromatin that have not been transcribed are located at the ends of the loops that were formed by the sister chromatids of a lampbrush chromosome.
What is unsourced chromomere?
Unsourced material may be challenged and removed. A chromomere, also known as an idiomere, is one of the serially aligned beads or granules of a eukaryotic chromosome, resulting from local coiling of a continuous DNA thread.
What is a linear pattern of chromomeres?
Chromomeres are organized in a discontinuous linear pattern along the condensed chromosomes (pachytene chromosomes) during the prophase stage of meiosis. The linear pattern of chromomeres is linked to the arrangement of genes along the chromosome.
Why are chromomeres present in prophase 1 of meiosis?
The chromomeres are present during leptotene phase of prophase I during meiosis. During zygotene phase of prophase I, the chromomeres of homologs align with each other to form homologous rough pairing (homology searching). These chromomeres helps provide a unique identity for each homologous pairs.