PRINCIPLES OF GENETICS AND VARIATION
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- Q1
Mendel's law were first published in the year
1875
1866
1928
1890
30s - Q2
Escherichia coli is an important material for genetic experiments because
D) Both[b] and [c]
B) It is haploid
A) It is harmless
C) It can be easily cultured
30s - Q3
Which of the character is dominant in pea plant
A) Wrinkled seeds containing tall plants
D) Neither[a] nor [b]
B) Red flower containing dwarf plant
C) Both [a] and [b]
30s - Q4
The segregation of paired hereditary factors that Mendel postulated occurs during
D) Prophase of first meiotic division
B) Metaphase of second meiotic division
C) During interphase between two meiotic divisions
A) Anaphase of first meiotic division
30s - Q5
In case of incomplete dominance in F2 generation
B) Phenotypic ratio is 3 : 1
A) Genotypic ratio is 3 : 1
C) Genotypic ratio = phenotypic ratio
D) Nothing can be concluded
30s - Q6
When a cell with 40 chromosomes undergoes meiosis, each of the four resulting cells has
D) 10 chromosomes
C) 80 chromosomes
A) 20 chromosomes
B) 40 chromosomes
30s - Q7
A recessive gene is one which
A) Occurs less frequently than a dominant one
C) Produces large amounts of RNA
D) Produces very less or no mRNA
B) Occurs only in heterozygotes
30s - Q8
Bacteria were grown in a medium containing heavy isotope of nitrogen (N15) for many generations and all their DNA contained many heavy nitrogen only. A bacterium of this type was transferred to normal medium and allowed to duplicate. After two divisions of heavy DNA is likely to be that
B) Two daughter cells have normal DNA and other two have both normal and heavy DNA
C) All daughter cells have heavy DNA
A) Only one daughter cell will have heavy DNA
D) Half daughter cells have heavy DNA and other half have normal DNA
30s - Q9
DNA generally acts as template for the synthesis of
A) Only protein
B) Only DNA
D) Both DNA and RNA
C) Only RNA
30s - Q10
Which RNA is having least age
D) None of the above
A) mRNA
C) rRNA
B) tRNA
30s - Q11
Which type of RNA is most abundant in cell
A) mRNA
B) tRNA
C) rRNA
D) catalytic RNA
30s - Q12
Which of the character is not applicable to t-RNA
A) It is the smallest of the RNAs
D) It is the largest of the RNAs
B) It acts as an adapter for amino acids
C) It has a clover leaf like structure
30s - Q13
tRNA is composed of about how many nucleotides
A) 50to 55
C) 92 to 98
B) 75 to 90
D) More than 100
30s - Q14
RR(Red) is crossed with ww (white), all the Rw offsprings are pink. This is anindication that R gene is
C) Incompletely dominant
30s - Q15
In his experiments on the chemistry of DNA, Chargaff estimated the base composition of human sperms and found that Adenine constituted 31% and Guanine19%. The quantity of Cytosine in the DNA of human somatic cell is likely to be
D) 68%
C) 38%
A) 31%
B) 19%
30s