Tag: CSIR NET Life Science Previous Year Questions and Solution Genetics

45. Autotetraploids arise by the doubling of 2n complement to 4m There are three different pairing possibilities at meiosis in tetraploids as given below: A. Two bivalents B. One quadrivalent […]

44. A colour blind father has a daughter who is also colourblind and has Turner’s syndrome. The genotype of the daughter is due to: (1) Translocation event in the father. […]

43. Red-blue colour blindness is a human X-linked recessive disorder. The two parents with normal colour vision have two sons. Son 1 has 47, XXY chromosome composition and is colour […]

42. In a family, father is homozygous dominant (AA) for a gene A and his wife is homozygous for its recessive allele (aa) showing albino phenotype. It was surprising that […]

41. The PAGE profile of certain marker associated with X chromosome was investigated for Klinefelter syndrome and results are shown below, it suggest that the non- disjunction of chromosome occurred […]

40. Aneuploid females with only one X chromosome is a characteristic of individuals with (1) Cri du chat syndrome (2) Klinefelter syndrome (3) Down syndrome. (4) Turner syndrome. Concept “Aneuploid […]

39. Turner syndrome results from (1) Monosomy of sex-chromosome. (2) monosomy of autosome. (3) nullisomy of sex-chromosome. (4) trisomy Of autosome. Explanation: Turner syndrome is typically associated with karyotype 45,X, […]

38. If a gamete produced following non disjunction of a chromosome at second meiotic division was fertilized by a normal gamete, what is the expected frequency of trisomic progeny? (1) […]

37. A cell undergoing meiosis produces four daughter cells, two of which are aneuploids, while two are haploid. This can occur due to: (1) Non-disjunction during first meiotic division only […]

36. What kind of aneuploid gametes will be generated if meiotic non-disjunction occurs at first division? (‘n’ represents the haploid number of chromosomes) (1) onlyn + 1 and n (2) […]