Question

What is the no. of centromere equal to ​

Answer 1

Explanation:

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The centromere is the specialized DNA sequence of a chromosome that links a pair of sister chromatids (a dyad).[1] During mitosis, spindle fibers attach to the centromere via the kinetochore.[2] Centromeres were first thought to be genetic loci that direct the behavior of chromosomes.

The centromere is the specialized DNA sequence of a chromosome that links a pair of sister chromatids (a dyad).[1] During mitosis, spindle fibers attach to the centromere via the kinetochore.[2] Centromeres were first thought to be genetic loci that direct the behavior of chromosomes.The physical role of the centromere is to act as the site of assembly of the kinetochores – a highly complex multiprotein structure that is responsible for the actual events of chromosome segregation – i.e. binding microtubules and signalling to the cell cycle machinery when all chromosomes have adopted correct attachments to the spindle, so that it is safe for cell division to proceed to completion and for cells to enter anaphase.[3]

The centromere is the specialized DNA sequence of a chromosome that links a pair of sister chromatids (a dyad).[1] During mitosis, spindle fibers attach to the centromere via the kinetochore.[2] Centromeres were first thought to be genetic loci that direct the behavior of chromosomes.The physical role of the centromere is to act as the site of assembly of the kinetochores – a highly complex multiprotein structure that is responsible for the actual events of chromosome segregation – i.e. binding microtubules and signalling to the cell cycle machinery when all chromosomes have adopted correct attachments to the spindle, so that it is safe for cell division to proceed to completion and for cells to enter anaphase.[3]There are, broadly speaking, two types of centromeres. "Point centromeres" bind to specific proteins that recognize particular DNA sequences with high efficiency.[4] Any piece of DNA with the point centromere DNA sequence on it will typically form a centromere if present in the appropriate species. The best characterised point centromeres are those of the budding yeast, Saccharomyces cerevisiae. "Regional centromeres" is the term coined to describe most centromeres, which typically form on regions of preferred DNA sequence, but which can form on other DNA sequences as well.[4] The signal for formation of a regional centromere appears to be epigenetic. Most organisms, ranging from the fission yeast Schizosaccharomyces pombe to humans, have regional centromeres.

Answer 2

Answer:

The number of centromere is equal to number of chromosome.  

Explanation:

• A chromosome consists two chromatids and a centromere. DNA is When a cell in the body separates, it will generate a duplicate of its DNA to every daughter cells.

• During cell division, the centromere connects a pair of sister chromatids together. This narrow region of chromosome links the sister chromatids,  generating a short arm and a long arm on the chromatids.
• The centromere acts as the site of assembly of the kinetochores  which is a highly complex multiprotein structure which is responsible for the real events of chromosome isolation such as building microtubules.
• Based on the position of the centromere, Chromosomes are divided into four types:-

1. Metacentric chromosome
2. Sub-metacentric chromosome
3. Acrocentric chromosome
4. Telocentric chromosome

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