Chromosome Structure

What does ‘somes’ of chromosomes mean?

(True or False?) Chromatin is at its most condensed in chromosomes at the metaphase stage of mitosis.

How many chromosomes are there in the sperm cells?

The two chromatids are held together by a narrow region called the ......................., forming a chromosome.

The combination of DNA and proteins is called .................

In order to prevent the DNA getting tangled up into knots, a precise scaffolding made of protein molecules is used. What are these proteins called?

List two types of chromosome based on the location of centromeres!

Before cell division, the chromosome is a double structure; made of two identical structures called ........................., joined together.

Each chromatid contains one .............. molecule.

The ................... is cylindrical in shape and is made up of eight histone molecules.

(True or False?) The genes in the heterochromatin are mostly inactive.

Two identical chromatids make one............

What does ‘chromo’ of chromosomes mean?

(True or False?) During the period between divisions (interphase) the majority is in the form of heterochromatin.

How many chromosomes are there in human somatic (body) cells?

.................. is a type of chromatin which is tightly coiled, as in the chromosomes seen at nuclear division.

.................. is a type of chromatin which is loosely coiled.