Question

Write a sentence about each of the following:
(i) Sheath
(ii) Matrix
(iii) Chromonemata
(iv) Centromere
(v) Secondary constriction
(vi) Telomere

Answer 1

(i) Sheath: Each chromosome is covered with a sheath made of proteins.

(ii) Matrix: The granular matter present inside the sheath of a chromosome is called matrix.

(iii) Chromonemata: Chromonemata are subunits of chromatids. These are two threads present inside the matrix of a chromosome.

(iv) Centromere: Centromere is also called primary constriction. It is a distinct region that divides the chromosome into two parts. It gets attached to the spindle network during cell division.

(v) Secondary constriction: Some chromosomes have an extra constriction in addition to primary constriction, called secondary constriction. It helps to identify chromosome from a set.

(vi) Telomere: The end of chromosome is termed as telomere.