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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) […]