Chromatin

Q.

How many autosomes and sex chromosomes are there in a somatic cell and in a sex cell?

1. Somatic cells have 22 autosomes and 2 sex chromosomes. Whereas Sex cells have 23 autosomes and 0 sex chromosomes.

2. Somatic cells have 44 autosomes and 2 sex chromosomes. Whereas Sex cells have 22 autosomes and 1 sex chromosomes.

3. Somatic cells have 46 autosomes and 0 sex chromosomes. Whereas Sex cells have 0 autosomes and 23 sex chromosomes.

4. Somatic cells have 44 autosomes and 2 sex chromosomes. Whereas Sex cells have 22 autosomes and 2 sex chromosomes.

Q.

What are the homologous pair of chromosomes?

Q.

What are non-histone chromosomal proteins?

Q.

The chromatin material is formed of:
(a) DNA only

(b) DNA and Histones

(c) Histones only

(d) Nucleotides

Q. Boys have XY chromosome and girls have XX. So which chromosome does a sexless person have?

Q.

Name the functional unit of DNA that carries genetic information.

Q.

The chromosomes in which centromere is situated close to one end are

1. Acrocentric

2. Metacentric

3. Sub-metacentric

4. Telocentric

Q.

Chromatin condenses into chromosomes during cell division.

1. True

2. False

Q.

Each chromosome consists of two units called chromatids.

1. True

2. False

Q.

In wich of the following stages will chromatin be visible?

1. Interphase

2. Metaphase

3. Prophase

4. Anaphase

Q.

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?

1. 42

2. 84

3. 63

4. 21

Q.

Why second constriction point is also known as known as Nuclear organiser region(NOR)?

Q. What are sex chromosomes. What role do they play in determining genetically the sex of an individual in human beings.

Q.

Telomerase is an enzyme which is a

1. RNA

2. Ribonucleoprotein

3. Simple protein

4. Repetitive DNA

Q.

Do Prokaryotes have circular DNA?

Q. Filiform apparatus is a characteristic feature of -

1. synergids
2. egg cell
3. vegetative cell
4. generative cell

Q.

Explain the relationship between a chromosome and genes?

Q. Which of the following occurs more than one and less than five in a chromosome?

1. Chromatid
2. Chromomere
3. Centromere
4. Telomere

Q.

The unit of inheritance is called ____________.

Q. Which process – diffusion, osmosis or active transport, needs involvement of energy?

Q.

The study of inheritance and variation is termed as __.

Q.

What are heterochromatin and euchromatin?

Q.

Chromosomes contain genetic information while chromatin network is devoid of genetic material.

1. True

2. False

Q.

How many chromosomes do humans have?

Q.

Name the stage when sister chromosomes separate from their paired conditions.

Q.

Why the child contain 23 chromosomes from the parent

Q.

A human being has _____ autosomes and ______ sex chromosomes.

1. 23 pairs, 1 pair

2. 22 pairs, 1 pair

3. 23 pairs, 23 pair

4. 20 pairs, 4 pair

Q.

What is the origin of DNA?

Q. (a) How is the study of human genetics done?
(b) The karyotype (set of chromosomes) shown below is taken from a dividing cell of a certain individual.
(i) Is the individual male or female? Explain your answer.
(ii) How would you expect a (1) female cell (2) sperm cell to differ in chromosome composition? [4 MARKS]

Q.

Which of the following substances are the building blocks of chromatin?

1. DNA and adenine

2. Histones and RNA

3. DNA and Histones

4. Adenine and DNA