1. The three codons which cause chain termination are
- TAG, TAA, TGA
- UAG, UGA, UAA
- AAT, TAG, UGA
- More than one of the above
Answer: UAG, UGA, UAA
2. Which one of the following is an example of Analogous organs?
- Hand of man and leg of horse
- Testis in males and ovaries in female developed from same embryonic tissue
- Wings of birds and bat
- Mouth parts of honeybee and housefly
Answer: Wings of birds and bat
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3. Homozygosity and heterozygosity of an individual can be determined by
- Test cross
- Back cross
- Self-fertilization
- All of the above
Answer: Test cross
4. Mendel’s findings were rediscovered by
- Correns
- Tschermark
- De Vries
- All
Answer: All
5. Which of the following assertions about ionizing radiation is false?
- They disrupt the chromosomes.
- The ionized cells display aberrant cell division
- Radiation dosages are directly inversely correlated with the frequency of caused mutations.
- Cancer is not caused by it.
Answer: Cancer is not caused by it.
6. How many sickle cell genotypes are there in the population?
- One
- Two
- Three
- Four
Answer: Three
7. From the list given below, select the character which can be acquired but not inherited
- colour of eye
- colour of skin
- size of body
- More than one of the above
Answer: size of body
8. The alternate form of a gene is
- Recessive character
- Alternate type
- Allele
- Dominant character
Answer: Allele
9. Pea plants were used in Mendel’s experiments because
- They were cheap
- They were available easily
- They had contrasting characters
- All of the above
Answer: They had contrasting characters
10. Which of the following types of mutations occurs the most frequently?
- Somatic mutation
- Germline mutation
- Forward mutation
- Backward mutation
Answer: Forward mutation
11. Which of the following techniques may be used to identify an inheritance pattern within a family?
- Pedigree analysis
- Chromosome analysis
- Nuclear analysis
- Cytoplasm analysis
Answer: Pedigree analysis
12. The zygote would develop into a female child if the sex determining pair of chromosomes is made up of
- A set of XX chromosomes
- A set of YY chromosomes
- A set of XY chromosomes
- More than one of the above
Answer: A set of XX chromosomes
13. The crossing of F1 to either of the parents is known as
- Test cross
- F1 cross
- Back cross
- All of the above
Answer: Black Cross
14. Which of the following chemicals can cause mutations in both replicating and non-replicating DNA?
- Acridines
- Nitrous acid
- Base analogs
- Mustard gas
Answer: Nitrous acid
15. Which of the following statement is not correct with respect to Deoxyribonucleic Acid
- It is found in all prokaryotic and eukaryotic cells and in many viruses.
- The DNA molecule consists of a single strand that is made of deoxyribose and
phosphate groups.
- DNA codes genetic information for the transmission of inherited traits.
- More than one of the above
Answer: The DNA molecule consists of a single strand that is made of deoxyribose and
phosphate groups.
16. The genotypic ratio of a monohybrid cross is
- 3:1
- 1:2:1
- 9:3:3:1
- 2:1:1
Answer: 1:2:1
17. Cystic fibrosis is
- Autosomal dominant disorder
- Sex-linked recessive disorder
- Sex-linked dominant disorder
- Autosomal recessive disorder
Answer: Autosomal recessive Disorder
18. When is it possible for a woman to be colorblind?
- The father has normal vision and the mother is a carrier
- The father has normal vision and the mother is colorblind
- The father is colorblind and the mother has a normal vision
- The father is colorblind and the mother is a carrier
Answer: The father is colorblind and the mother is a carrier
19. Who among the following proposed the twisted ladder model of DNA structure in 1953?
- James Watson and Francis Crick
- Rosalind Franklin and Maurice Wilkins
- Friedrich Miescher and Erwin Chargaff
- More than one of the above
Answer: James Watson and Francis Crick
20. The tendency of an offspring to resemble its parent is known as
- Variation
- Resemblance
- Heredity
- Inheritance
Answer: Heredity
21. The smallest unit of genetic material which produces a phenotypic effect on mutation is
- Gene
- Muton
- Nucleic acid
- Recon
Answer: Muton
22. What is the genotypic ratio in a monohybrid cross ?
- 4∶ 2∶ 1
- 3 ∶ 1
- 1 ∶ 2 ∶ 1
- More than one of the above
Answer: 1 ∶ 2 ∶ 1
23. Which of the following statements is true regarding the “law of segregation”?
- Segregation of factors is due to the segregation of chromosomes during meiosis
- Law of segregation is the law of purity of genes
- Alleles separate from each other during gametogenesis
- All of the above
Answer: all of the above
24. Alleles are
- Linked genes
- Alternate forms of genes
- Homologous chromosomes
- Chromosomes that have crossed over
Answer: Alternate forms of genes
25. Which of the following assertions about alpha-thalassemia is false?
- Involves the HBA1 and HBA2 genes
- Is inherited in a Mendelian dominant manner
- Is associated with the deletion of the 16p chromosome
- Leads to a reduction in the synthesis of globin
Answer: Is inherited in a Mendelian dominant manner
26. An exception to Mendel’s law is
- Linkage
- Independent assortment
- Purity of gametes
- Dominance
Answer: Linkage
27. Which of the following claims about polyploidy is false?
- It is frequently observed in plants
- Causes sterility in animals
- Reduces the number of chromosomal sets
- Either increases or increases the number of chromosome sets
Answer: Reduces the number of chromosomal sets
28. Who is known as the “Father of Genetics”?
- Mendel
- Morgan
- Bateson
- Watson
Answer: Mendel
29. 'V' shaped chromosomes are:
- Metacentric
- Sub metacentric
- Acrocentric
- More than one of the above
Answer: Metacentric
30. What is a 'gene' used in cell biology?
- It is the DNA inside the nucleus.
- It is the membrane of the nucleus.
- It is a unit of inheritance
- More than one of the above
Answer: It is a unit of inheritance
