Introduction to Genetics

Q. The secretion of which gland helps in the lubrication of the penis

1. Bulbourethral gland
2. Prostate gland
3. All of the above
4. Seminal vesicle

Q. Which of the following statements about agarose gel electrophoresis is/are incorrect?

I. It is a common method used to separate the DNA fragments based on their size.
II. The DNA fragments can be detected by ethidium bromide staining followed by exposure to ultraviolet rays.
III. The movement of DNA is modulated by the strength of the electric field.
IV. The electric field allows the migration of positively charged DNA towards the negative terminal.

1. I and II
2. I, II and IV
3. Only III
4. Only IV

Q. A DNA contain 30, 000 base pairs. How many nucleotides would be present in it?

1. 3000
2. 30, 000
3. 3, 00, 000
4. 60, 000

Q.

Transgenic organisms are produced by

1. deleting sex chromosomes
2. inducing gene mutations
3. introducing foreign genes
4. arresting spindle fibre formation

Q. In several fungi and plants the bisexual condition is denoted by

1. Homothallic and monoecious
2. Heterothallic and monoecious
3. Homothallic and dioecious
4. Heterothallic and dioecious

Q. What would happen if syngamy does not occur?

Q. How many alleles of a gene are present on each chromosome in a diploid individual?

1. One
2. Three
3. Two
4. Can’t be determined

Q. In agarose gel electrophoresis, the DNA fragments are separated under

1. the influence of electric field
2. the influence of heat
3. diffusion across gel
4. the influence of light

Q. In agarose gel electrophoresis, DNA fragments appear as orange coloured bands after staining with:

1. Acetocarmine, under UV radiation
2. Ethidium bromide, under UV radiation
3. Methylene blue, under UV radiation
4. Ethidium bromide, under visible light

Q. Can you think of any reason why there is a need for large-scale production of recombinant products?

Q. Study the gel electrophoresis of the DNA sample given below and select the correct statement among the following.

1. DNA fragment in band 1 has the largest size
2. The DNA fragments in all the bands have same size
3. DNA fragment in band 5 is more positively charged than that in band 1
4. The DNA fragment in band 4 has the smallest size

Q. In genetic engineering, restriction enzymes are used for cutting

1. bacterial DNA only
2. eukaryotic DNA
3. viral DNA
4. any DNA fragment

Q. When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be

1. pseudoalleles
2. multiple alleles
3. part of the same gene
4. different genes

Q.

Locations on sites in the human DNA where single base DNA differences occurs are called

1. Repetitive DNA

2. VNTR

3. SSCP

4. SNP

Q. Which statement is correct?

(A) Degeneracy of code is related to third member of codon

(B) Single codon, codes for more than one amino acid

(C) In codon first two bases are more specific

(D) In codons third base is wobble

(E) code is universal

1. 
   A, B, C, D, E
2. 
   A, B, D
3. 
   A., C, D
4. 
   A, C, D, E

Q.

What is the maximum number of alleles a gene can have?

Q. Introduction of food plants developed by genetic engineering is not desirable because:

1. Economy of developing countries may suffer
2. These products are less tasty as compared to the already existing products
3. This method is costly
4. There is a danger of coming viruses, allergens and toxins with introduced crop.

Q.

Can genotype change under the influence of environment?

Q.

The difference that exists between progeny and parents is known as variation.

1. True

2. False

Q. Marchantia is considered heterothallic because it is

1. Dioecious
   
2. Monoecious
   
3. Heterogametic
   
4. Bisexual
   

Q. Recognise the figure and find out the correct matching.

1. a-oogonium, b-antheridium
2. a-antheridium, b-oogonium
3. a-male thallus, b-female thallus
4. a-female thallus, b-male thallus

Q. Restriction endonuclease, an enzyme used in genetic engineering, is employed for:

1. Probing exons
2. Cutting double-stranded DNA
3. Cutting single-stranded DNA
4. Joining strands of DNA

Q. Which of the following processes is used for creating genetic variation by changing the base sequence within genes resulting in the creation of a new character or trait not found in the parental type?

1. Selection
2. Hybridization
3. Mutation
4. Breeding

Q. The progenies are found to be male sterile after crossing two plants. This is due to some genes that are present in

1. mitochondria
2. cytoplasm
3. nucleus
4. chloroplast

Q.

The process of transmission of parental characters to progeny is called

1. Transfusion

2. Variation

3. Inheritance

4. Cloning

Q. If 15% of the gametes produced after meiosis are recombinant for two genes, the distance between the two genes will be

1. 7.5 cM
2. 30 cM
3. 60 cM
4. 15 cM

Q. Genes involved in cancer are

Q. Which of the following methods uses electrical impulses to enable gene transfer?

1. Gene gun
2. Microinjection
3. Electroporation
4. All of the above

Q. When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be

1. pseudoalleles
2. multiple alleles
3. part of the same gene
4. different genes

Q. The process by which DNA is recovered from gels after electrophoresis is called as __________.

1. Capillary electrophoresis
2. Slab electrophoresis
3. Denaturing electrophoresis
4. Electro-elution