Question

write a short note on chromatids

Answer 1

A chromatid is one-half of two identical copies of a replicated chromosome. During cell division, the identical copies are joined together at the region of the chromosome called the centromere. Joined chromatids are known as sister chromatids. Once the joined sister chromatids separate from one another in anaphase of mitosis, each is known as a daughter chromosome.

Chromatids are formed from chromatin fibers.

Chromatin is DNA that is wrapped around proteins and further coiled to form chromatin fibers. Chromatin allows DNA to be compacted in order to fit within the cell nucleus. Chromatin fibers condense to form chromosomes.

Prior to replication, a chromosome appears as a single-stranded chromatid. After replication, the chromosome has the familiar X-shape. Chromosomes must be replicated and sister chromatids separated during cell division to ensure that each daughter cell receives the appropriate number of chromosomes. Every human cell contains 23 chromosome pairs for a total of 46 chromosomes. The chromosome pairs are called homologous chromosomes. One chromosome in each pair is inherited from the mother and the from the father. Of the 23 homologous chromosome pairs, 22 are autosomes (non-sex chromosomes) and one pair consists of sex chromosomes (XX-female or XY-male).

Answer 2

A Chromatids is one copy of a newly copied Chromosome which is still joined to the original Chromosome by a single centrmere . Chromatic pairs are normally genetically identical and said to be homozygous .hope helpful