2.Mendel’s monohybrid ratio is outcome of (1) Independent assortment of genes (2) Hardy-Weinberg law (3) Uncontrolled matting (4) Separation of homologous chromosomes during meiosis Explanation: In a monohybrid cross, F1 […]
Tag: CSIR NET Life Science Previous Year Questions and Solution Genetics
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CSIR NET Life Science Previous Year Questions and Solution on Genetics
Phenotypic ratio in the F2 generation of a monohybrid cross
1. When a F1 generation of a monohybrid cross is allowed self-fertilize, the expected phenotypic ratio is (1) 2:1 (2) 3:1 (3) 4:1 (4) 3:4 Monohybrid Cross: Detailed Explanation […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
What condition best defines autopolyploidy in plants?
Whichone of the following conditions represents autopolyploidy? (1) More than two sets of chromosomes. both of Which are form the same parental species. (2) More than two sets of chromosomes, […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
Why Triticum aestivum (bread wheat) is an allopolyploid
48. Triticumaestivum is an example of (1) Allopolyploid (2) Autopolyploid (3) Chromosome doubling (4) Auto-allopolyploid Core explanation Common bread wheat, Triticum aestivum, has genome composition AABBDD with 2n = 42. These three […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
Chromosome number changes in diploid species: autotriploid, allotetraploid, monosomy, double trisomy, and nullisomy
47. A species of plant (species 1) is diploid (2n = 6) with chromosomes AABBCC and a related species (species 2) is also diploid (2n = 4) with chromosomes PPQQ. […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
How to find sporophytic ploidy from a 6N endosperm and a backcross
46. Two near inbred parental lines P1 and P2 of an angiosperm species are crossed to produce F1 seeds in which. theplojdv of the endosperm is 6N. If plants generated […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
Which meiotic pairings in autotetraploids can give diploid (2n) gametes?
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 […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
Why a colour-blind Turner girl from a colour-blind father indicates maternal nondisjunction
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. […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
Origin of XXY colour‑blind son from normal parents without crossing over
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 […]
CSIR NET Life Science Previous Year Questions and Solution on CHROMOSOMES ABERRATIONS
How can an AA × aa cross produce an albino (aa) child?
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 […]
