Chromosomes

Q.

What are 3 differences between prokaryotic and eukaryotic cells?

Q.

What are polytene chromosomes and how are they formed?

Q.

Chromosomes are made up of

1. DNA only

2. Protein only

3. DNA and Protein

4. RNA only

Q.

Which of the following statements is not true of two genes that show 50% recombination frequency?

1. if the genes are present on the same chromosome, they undergo more than one crossover in every meiosis

2. the genes show an independent assortment

3. the genes are tightly linked

4. the genes may be on different chromosomes

Q.

When a diploid female plant is crossed with a tetraploid male, the ploidy of endosperm cells in the resulting seed is:

1. pentaploidy

2. tetraploidy

3. triploidy

4. diploidy

Q.

In which phase do the chromosomes become visible?

1. Metaphase

2. Prophase

3. Metaphase

4. Anaphase

Q.

Who is known as the father of genetics?

Q.

How many sets of chromosomes are found in a human somatic cell?

Q.

How many types of operons are there?

Q.

What is chiasmata?

Q.

Which diagram shows the sex chromosomes when a sperm fertilises an egg to produce a baby girl?

1. 

2. 

3. 

4. 

Q. In which stage are the chromosomes most distinct?

Q. What is the meaning of :
Terminalization of chiasmata?

Q.

Where are chromosomes present in a cell?

Q.

The lac I gene product is involved in gene control regulating the lactose operon of E.coli.

1. Feedback inhibition because excess of -galactosidase can switch off transcription

2. Negative and repressible because repressor protein prevents transcription

3. Negative and inducible because repressor protein prevents transcription

4. Positive and inducible because it can be induced by lactose

Q.

Humans have 46 chromosomes. How many chromosomes will their sperm and egg have?

1. 26

2. 27

3. 23

4. 20

Q.

How many genes control skin color in humans?

Q.

Independent assortment of genes does not take place when:

1. Genes are linked and located on the same chromosome

2. Genes are located on homologous chromosomes.

3. Genes are located on non-homologous chromosomes

4. All of these

Q.

What is the difference between chromatin fibre and chromosome ?

Q.

What is AS And SS genotype?

Q.

How many chromosomes does a mature human sperm cell contain?

1. 1

2. 2

3. 23

4. 46

Q.

Is Klinefelter syndrome a trisomy?

Q.

What is the segment of DNA?

Q. A : The gametes will be having half the number of chromosomes as compared to non-reproductive cells.
B : A zygote will also have only half the number of chromosomes.
Which option(s) would be right?

1. Only B is correct
2. Only A is correct
3. Both A and B are correct
4. Both A and B are wrong

Q.

How are the traits expressed in an organism?

Q.

What is an inducible operon?

Q.

The DNA fragments separated on an agarose gel can be visualised after staining with

1. Bromophenol blue

2. Acetocarmine

3. Aniline blue

4. Ethidium bromide

Q.

Information on protein is provided by which section of DNA?

1. Gene

2. Nucleus

3. Chromosome

4. Trait

Q. How many chromosomes will the cell have at G1 phase, after the S-phase, and after M-phase respectively, if it has 14 chromosomes at interphase?

1. 14, 14, 7
2. 14, 14, 14
3. 7, 7, 7
4. 7, 14, 14

Q.

State the difference between :
(a) Chromosome and chromatid,
(b) Centrosome and centromere,
(c) Aster and spindle fibres.
(d) Haploid and diploid