Question

The sister chromatids are held together by a) Centrioles b) Chromomere
c) Chromonemata
d) Centromere

Answer 1

Answer:

b) Centromere

Explanation:

Two sister chromatids are joined together by the centromere. The centromere is a position of a DNA where a pair of sister chromatids are linked together. only one centromere is found in a chromosome. The types of chromosomes are defined on the basis of their position of the centromere. Four types of the centromere are there:

1.  Metacentric

2. Sub-metacentric

3. Acrocentric

4. Telocentric

Answer 2

The correct answer is d) Centromere.

Explanation:

• The Centromere is found at the primary constriction of the chromosome.
• It is the location at which the sister chromatids remain attached to each other.
• The region has high deposition of a particular protein called the Cohesin.
• The position of the centromere can vary along the length of the chromosome:

1. Telocentric - Centromere at the end of the chromosome.
2. Acrocentric - Centromere near the chromosome end.
3. Sub-meta centric - Centromere near the middle region of the chromosome.
4. Meta-centric - Centromere exactly at the middle of the chromosome.