Chromosomal Basis of Inheritance Solved MCQs

 

Chromosomal Basis of Inheritance Multiple Choice Questions MCQs with Answers

1. Lampbrush chromosomes (LBCs) found in which of the following?
a. Cancer cells
b. Oocytes
c. Salivary glands
d. Lymph glands
Answer: b. Oocytes

2. According to the chromosomal theory of inheritance, the similar chromosomes pair during:
a. Mitosis
b. Karyokinesis
c. Meiosis
d. S phase
Answer: c. Meiosis

3. The highly condensed portions of the chromatin are called:
a. Heterochromatin
b. Euchromatin
c. Chromatids
d. Nucleosome
Answer: a. Heterochromatin

4. According to the chromosomal theory of inheritance, the reproduction involves the union of:
a. One cell
b. Two cells
c. Three cells
d. Five cells
Answer: b. Two cells

5. The first evidence of the hereditary nature of DNA was provided by:
a. Watson-Crick
b. Friedrich Miescher
c. Mullis
d. Mendel
Answer: b. Friedrich Miescher

6. Chromosomes are …………..like structures that appear during cell division.
a. Needle
b. Pin
c. Rod
d. Thread
Answer: d. Thread

7. Which of the following are components of chromosomes?
a. RNA and proteins
b. DNA and proteins
c. Proteins and carbohydrates
d. Proteins and lipids
Answer: b. DNA and proteins

8. A typical human chromosome contains:
a. 120 million nucleotide
b. 125 million nucleotide
c. 130 million nucleotide
d. 140 million nucleotide
Answer: d. 140 million nucleotide

9. How much DNA is present in a chromosome?

a. 20%
b. 40%
c. 50%
d. 60%
Answer: b. 40%

10. The complex of nucleotide and histone proteins is called:
a. Heterochromatin
b. Euchromatin
c. Nucleosome
d. All of these
Answer: c. Nucleosome

11. How many nucleotides are present in a typical nucleosome?
a. 8
b. 200
c. 50
d. 300
Answer: b. 200

12. Which protein is present in chromosomes mainly?
a. Histone
b. Keratin
c. Biotin
d. All options
Answer: a. Histone

13. Typically a chromosome is made of:
a. Chromatids
b. Centromere
c. Secondary constriction
d. All of these
Answer:

14. The blue-green algae and bacteria contain…?
a. Five linkage group
b. One linkage group
c. Two linkage groups
d. Three linkage groups
Answer: b. One linkage group

15. Structure that is present on the chromosome:
a. Nucleolus
b. Centrosome
c. Centromere
d. Centrochrome
Answer: c. Centromere

16. The chromosomal theory of inheritance was proposed by:
a. Watson and Crick
b. Morgan and Mendel
c. Sutton and Boveri
d. W. Waldeyer
Answer: c. Sutton and Boveri

17. The term chromosome was coined by which of the following anatomist?
a. W. Waldeyer
b. Watson and Crick
c. Walter Sutton
d. Theodor Boveri
Answer: a. W. Waldeyer

18. Which of the following statement is true about the Chromatids?
a. It is a duplicate chromosome
b. It is one-half of the replicated chromosome
c. It is a complete chromosome
d. It is a haploid chromosome
Answer: b. It is one-half of the replicated chromosome

19. Who demonstrated and confirmed that genes are located on chromosomes?
a. W. Waldeyer
b. Watson and Crick
c. Thomas Hunt Morgan
d. Walter Sutton
Answer: c. Thomas Hunt Morgan

20. Chromosomes found in the salivary gland cells of Drosophila and Chironomus are:
a. B-chromosomes
b. Supernumerary
c. Lampbrush
d. Polytene
Answer: d. Polytene

21. The centromere is a very specific part of the chromosome where….?
a. Nicking occurs
b. Nucleoli are formed
c. Crossing-over takes place
d. Chromatids are attached
Answer: d. Chromatids are attached

22. The distinctive structures found at the ends of chromosomes are known as:
a. Kinetochore
b. Telomeres
c. Centromeres
d. Chromeres
Answer: b. Telomeres

23. Which of the following scientist first discovered the chromosomes in 1878?
a. Waldeyer
b. Walther Flemming
c. Strasburger
d. Francis Crick
Answer: b. Walther Flemming

24. Which of the following chromosome is a chromosome whose centromere is subterminal?
a. Acentric
b. Telocentric
c. Acrocentric
d. Metacentric
Answer: c. Acrocentric

25. The giant chromosome which contains a number of chromonemeta is:
a. Hetrochromosome
b. Lampbrush
c. Supemumeracy
d. Polytene
Answer: d. Polytene

26. Which of the following chromosomes have the centromere located midway between the ends of the chromosome?
a. Acentric
b. Telocentric
c. Acrocentric
d. Metacentric
Answer: d. Metacentric

27. Puffs and Balbiani rings in the salivary gland chromosome are the sites of active:
a. DNA duplication
b. DNA replication
c. Protein synthesis
d. RNA synthesis
Answer: d. RNA synthesis

28. What does a male somatic cell contain?
a. Only one sex-linked gene for each character
b. Two genes for every sex-linked character
c. Genes on only on sex chromosomes
d. No gene on the sex chromosome
Answer: a. Only one sex-linked gene for each character

29. The gene which causes red and green types of color blindness is found only on:
a. X-chromosome
b. Y-chromosome
c. Both X and Y chromosome
d. Z-chromosome
Answer: a. X-chromosome

30. Which of the following is a sex-linked disease?
a. Colour blindness
b. hemophilia
c. muscular dystrophy
d. All of these
Answer: d. All of these