Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Genetics

Multiple Choice Questions on Genetics

1.  First eukaryotic genome sequenced was that of

A) Haemophilus influenzae  B) Caenorhabditis elegans

C) Neurospora crassa   D)Saccharomyces cerevisiae

2. DNA and RNA differ in
A) Sugar only
B) Sugar and purines
C) Sugar and pyrimidines
D) Sugar and phosphate

3. If the GC content of a DNA molecule is 52%, what are the percentage of the four bases in the DNA molecule?
A) G 32% C 20% T 20% A 28%

B) G 20% C 20% T 24% A 24%

C) G 26% C 26% T 24% A 24%

D) G 25% C 26% T 24% A 24%

4. A polyploidy which contains genomes all the same species is called
A) Allopolypoid  
B) Amphidiploid  C) Aneuploid  D)  Autopolyploid

5. A homozyogous plant having red flowers is crossed with a homozygous plant bearing white flowers, the offspring are:

A) All with red flowers B) all with white flowers 

c) Half with white flowers d) Half with red flowers   

6. Mutation theory of evolution was proposed by

A) De Vries  B) Darwin C) Weismann  D) Lamarck

7. Genes that occur only in Y chromosome are called

A) Lethal genes  B) plasma genes C) Holandric genes D) Duplicate genes

8. Eukaryotic and Prokaryotic genome differs by having:
A) DNA is circular and single stranded in prokaryotes

B) DNA is complexed with histone in prokaryotes

C) Repetitive sequences are present in eukaryotes

D) Genes in the former case are organized into operons

9. When a gene exists in more than two alleic forms, the phenomenon is called

A) polygenes B) Multiple allelism C) Pleiotropism D) Multiple genes

10. A short length of DNA molecule contains 120 adenine and 120 Cytosine bases. The total number of nucleotide in this DNA segment is:

A) 480 B) 240 C) 120 D) 60

Learn more:

1. D)Saccharomyces cerevisiae

2. C) Sugar and pyrimidines

3. C) G 26% C 26% T 24% A 24%

4. D)  Autopolyploid

5. A) All with red flowers

6. A) De Vries

7. C) Holandric genes

8. C) Repetitive sequences are present in eukaryotes

9. B) Multiple allelism

10. A) 480

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