CBSE Class 12 - Biology - Chapter - Genetics (MCQs for AIPMT/NEET) (#cbsenotes)

Genetics 

CBSE Class 12 - Biology - 

(MCQs for AIPMT/NEET)

Q1: Removal of introns and joining the exons in a defined order in a transcription unit is called

(a) Splicing
(b) tailing
(c) transformation
(d) capping


Q2: Klinefelter’s syndrome is indicated by an XXY sex chromosome combination. This abnormality is due to:

(a) gene deletion.
(b) gene duplication.
(c) gene translocation.
(d) non-disjunction.


Q3: Molecular basis of organ differentiation relies on modulation in transcription by

(a) RBA polymerase
(b) ribosome
(c) anticodon
(d) transcription factor




Q4: Amino acid sequence in protein synthesis is decided by the sequence of 

(a) tRNA
(b) mRNA
(c) cDNA
(d) rRNA


Q5: Telomerase is an enzyme which is 

(a) ribonucleoprotein
(b) RNA
(c) simple protein
(d) repetitive DNA


Q6: By convention, a genotype of RR would indicate

(a)    homozygous dominant on any chromosome.
(b) homozygous recessive on autosomes.
(c) heterozygous on male sex chromosomes.
(d) heterozygous on autosomes.


Q7: The recessive genes located on X chromosome in humans are always

(a) lethal
(b) sublethal
(c) expressed in males
(d) expressed in females


Q8: Pleiotropic gene is

(a) thalesmia
(b) colour blindness
(c) haemophilia
(d) sickle cellanemia


Q9: Mutation generally produces 

(a) lethal genes
(b) recessive genes
(c) polygenes
(d) dominant genes


Q10: If a recombinant DNA carrying antibiotic resistance gene (e.g., tetracycline) is transferred into an E.coli cell, then the host cell is transformed into tetracycline resistant cell. The tetracycline resistant gene in this case is called a

(a) vector
(b) selectable marker
(c) cloning site
(d) recombinant protein.


Answer:
1: (a) splicing
2: (d) nondisjunction
3: (d) transcription factor
4: (b) mRNA
5: (a) ribonucleoprotein
6: (a) homozygous dominant on any chromosome.
7: (c) expressed in males
8: (d) sickle cell anemia
9: (b) recessive genes
10: (c) cloning site