Chromosomal Basis of Inheritance MCQ (Multiple Choice Questions and Answers)
Q1. Term chromosome was coined by
- Hoffmeister
- Sutton
- Boveri
- Waldeyer
Q2. Chromosomes were first seen by
- Hoffmeister
- Waldeyer
- Strasburger
- Fleming
Answer:1
Q3. Chromosomes found in the salivary gland of drosophila is
- Lampbrush
- Polytene
- Supernumerary
- B-chromosomes.
Answer:2
Q4. Giant chromosome with a number of chromonemeta is
- Lampbrush chromosome
- Hetrochromosome
- Supernumerary chromosome
- Polytene chromosome
Answer:4
Q5. Lampbrush chromosomes occur in
- Salivary glands
- Lymph gland
- Cancer cells
- Oocytes
Answer:4
Q6. Chromosome ends are called
- Satellites
- Tellomeres
- Centromeres
- Kinetochore
Answer:2
Q7. Chromatid is
- One-half of chromosome
- Haploid chromosome
- Complete chromosome
- Duplicate chromosome
Answer:1
Q8. Centromere is that part of chromosome where
- Nucleoli are formed
- Crossing over takes place
- Chromatids are attached
- Nicking occurs
Answer:3
Q9. A chromosome with sub-terminal centromere is
- Acentric
- Acrocentric
- Metacentric
- Telocentric
Answer:2
Q10. A chromosome with centromere near the middle is
- Metacentric
- Sybmetacentric
- Acrocentric
- Telocentric
Answer:2
Q11. Puffs or balbiani rings in salivary gland chromosome are site of
- DAN replication
- DNA duplication
- RNA synthesis
- Protein synthesis
Answer:2
Q12. Chromosome theory of inheritance was proposed by
- Sutton (1902)
- Boveri (1902)
- Both 1 and 2
- Correns(1909)
Answer:3
Q13. More than 200 chromosomes occur in
- Chicken
- Dog
- Amoeba
- Gorilla
Answer:3
Q14. Drosophila has four homologous pairs of chromosome. What is the number of linkage group in this animal?
- 4
- 2
- 8.
- Uncertain
Answer:4
Q15. Gene for colour blindness in man is located on
- X-chromosome only
- Y-chromosome only
- Either X-chromosome or Y-chromosome
- Both X and Y chromosome
Answer:1
Q16. A colour blind daughter may be born if the
- Father is normal and mother is colour blind
- Father is colour blind and mother is normal
- Father is normal and mother is carrier
- Father is colour blind and mother is carrier
Answer:4
Q17. A somatic cell in human male contains
- No gene on sex chromosome
- Only one sex linked gene for each character
- Two genes for every sex linked character
- Genes on only on sex chromosomes
Answer;2
Q18. A normal woman is married to a colour blind man. The children are expected to be
- All normal
- 50% sons are colour blind
- All daughters are normal but carrier whereas all sons are normal phenotypically as well as genotypically
- 50% daughters are colour blind
Answer:3
Q19. Which of the following dieses is sex linked?
- Colour blindness
- Malignancy
- Hepatitis
- Lukemia
Answer:1
Q20. The genes for the eye colour and size of the wing in drosophila are located on the same chromosome. They can be separated by
- Non-disjunction
- Crossing over
- Hybridisation
- Not be separated at any stage
Answer:2
Q21. A colour blind son is born to a normal parents. It shows that
- The father was hetrozygous for colour blindness
- The mother was hetrozygous for colour blindness
- The mother was genotypically homozygous
- Both parents carried a recessive gene for the disorder
Answer:3
Q22. Chromosomal constitution in human female can be best written as
- 46
- 44+2
- 44A+XX
- 44A+XY
Answer:3
Q23. The sex linked characters are those
- Which are related to sexual physiology
- The genes of which are present on the sex chromosomes
- Which appear either in male and female
- Which are controlled by sex hormones
Answer:2
Q24. Chromosomes other than sex chromosomes are called
- Autosomes
- Heterosomes
- Karyosomes
- None of the above
Answer:1
Q25. If the crossing over had occurred at two strand stage in neurospora the ascospores would be arranged in
- 1-1 position
- 2-2 position
- 4-4 position
- None of these
Answer:3
Q26. Complete linkage is found in
- Birds
- Snakes
- Female drosophila
- Male drosophila
Answer:4
Q27. In most of the higher unisexual animals there is one chromosomal pair which is not identical in two sexes , these are called
- Non homologous chromosomes
- None identical chromosomes
- Non compatible chromosomes
- Sex chromosomes
Answer:4
Q28. The to diverse disciplines of cytology and genetics were correlated by
- Muller
- Morgan
- Bridges
- Tschermak
Answer:3
Q29. Linkage group is defined as
- All the linked genes of a chromosomal pair
- Different groups of genes present on different chromosomes
- All the genes located on the same chromosome
- None of the above
Answer:1
Q30. Linkage in drosophila was reported by
- Mendel
- Correns
- Morgan
- None of these
Answer:3
Q31. Phenomenon which works opposite to the linkage is
- Independent assortment
- Crossing over
- Segregation
- Mutation
Answer:2
Q32. When two genes are situated very close to one another at a chromosome
- The percentage of crossing over between them is very high
- Hardly any cross overs are produced
- No crossing over can take place
- Only double Cross overs can occur between them
Answer:2
Q33. Greater is the distance between the two genes on chromosome
- Greater is the linkage strength
- Lesser is the linkage strength
- Linkage strength remains unchanged
- There is no relationship between the two
Answer:2
Q34. Crossing over occurs at
- Single strand stage of chromosomes during prophase
- 2 strand stage during zygotene
- Four strand stage of Pachytene
- Metaphase II of meiosis
Answer:3
Q35. The term coupling and repulsion signify the same phenomenon which is termed
- Synapsis
- Disjunction
- Linkage
- Non disjunction
Answer:3
Q36. The linked characters would always inherit together till they are
- Delinked due to segregation
- Mask by dominance
- Mutated
- Separated due to crossing over
Answer:4
Q37. White eyed and long wind male drosophila was crossed to a vestigial winged red eyed female. The two characters are linked in this animal when a female F1 was just crossed the F2 generation produced
- Mostly white eyed with long wings
- Mostly red eyed with vestigial wings
- Mostly white eyed with long wings and red eyed with vestigial wings
- All white eyed and vestigial winged
Answer:3
Q38. A haemophilic man marries a normal women, what is the probability of the disease in the grandchildren in case the daughter marries a normal man
- All grandsons would be haemophilic and granddaughters normal
- 50% of grandsons are hemophilic other grandchildren are normal
- Only granddaughters would be haemophilic
- All grandchildren would be haemopgilic
Answer:2
Q39. Colour blind man marries abnormal woman whose father was colorblind what percentage of children is expected to be colour blind
- 25%
- 50%
- 75%
- 100%
Answer:2
Q40. Mendel did not get any linkage in his experiments on pea , one of the reasons was that
- He did not keep an exact record
- There is no linkage in pea
- He did not have means to detect linkage
- All the 7 characters selected by him were present on different chromosomes or showed 50% crossovers
Answer:4
Q41. The genes of different traits located on different loci on the same chromosome are
- Alleles
- Linked
- Pleiomorphic
- Mutated
Answer:2
Q42. In four o’clock plant normal leaves A and veriegated leaves B occur in different plants, if B male is crossed with A female the hybrid has normal lives but when B female is crossed with A male the hybrid has veriegated leaves , it is a case of
- Mutation
- Cytoplasmic inheritance
- Complementary genes
- Supplementary genes
Answer:2
Q43. Crossing over occurs between
- Two non sister chromatids of a homologous pair of chromosomes
- Two chromatids of any chromosomes
- Two chromatids of same chromosome
- All the foregoing
Answer:1
Q44. Neurospora crassa is widely used in genetic studies because of all the following except one
- It is a haploid plant and mutations can be easily detected
- It can be easily cultured
- Life cycle short
- Sports are not affected by mutagenesis
Answer:4
Q45. The frequency of crossing over would be higher if
- Two genes are located closely
- Two genes are far apart on a chromosome
- Two genes are not located on the same chromosome
- None of the above
Answer:2
Q46. Mendelian recombinations are due to
- Mutation
- Linkage
- Crossing over
- Independent assortment of characters
Answer:4
Q47. The blue green algae and bacteria contain
- One linkage group
- Two linkage groups
- Three linkage groups
- None of the above
Answer:1
Q48. Which one of the following character in man is controlled by a recessive gene?
- Colour blindness
- Woolly hair
- Brachydactyly
- Curly hairs
Answer:1