1. Cytoplasmic Male Sterility in maize is due to- (1) Cytoplasm (2) Plastid (3) Mitochondria (4) Ovary Introduction Cytoplasmic Male Sterility (CMS) in maize is a condition that causes the […]
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CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Essential Criteria for Effective Marker-Assisted Selection (MAS) in Plant Breeding
55. Marker-assisted selection (MAS) defined as selection based on molecular markers should have some important criterion for plant breeding activities. Some statements about these criteria are mentioned below: A. Marker […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
DNA Markers to Distinguish Homozygote and Heterozygote
54. Which one of the following DNA markers can be used to distinguish between a homozygote and heterozygote? (1) RAPD (2) AFLP (3) RFLP (4) ISSR Introduction: DNA markers are […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Understanding SSR Primers and Their Target Regions in Simple Sequence Repeat Scanning
53. In scanning Simple Sequence Repeats (SSR) primers are used against (1) Random sequence (2) Repetitive sequence (3) Flanking region of repetitive sequence (4) Conserved region of exon of gene […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Centromere Mapping in Linear Tetrads
Centromere positions can be mapped in linear tetrads in some fungi. A cross was made between two strains a b and a+ b+ and 100 linear tetrads were analysed. The […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Neurospora linked loci mapping from ordered octads
51. Fertilization between two mating types (Pl and P2) of Neurospora, led to a diploid ascus cell, which gave rise to ascus containing 8 haploid ascospores. A set of DNA […]
![50. The following table summarizes the result of a cross between two strains of Neurospora having the alleles D and d, respectively. The table shows the different patterns of octad arrangement and the number of ascus observed of each type. Octads D d D d D d D d D d D d D d d D d D D d d D d D d D D d d D d D D d d D d D d D D d d D d D D d 115 125 14 16 17 13 Number of ascus observed Based on the above, fill in the blanks from the options given below. "The first two columns are from meiosis with nocrossover between locus D and __[A]__. The patternfor these two columns represent __[B]__ segregation pattern. The distance between the locus D and thecentromere is __[C]__ map units". A B C (1) d allele first division 10 (2) Centromere first division 10 (3) d allele second division 20 (4) Centromere second division 10](https://www.letstalkacademy.com/wp-content/uploads/2025/12/50-1.png)
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Neurospora Octad Analysis
The following table summarizes the result of a cross between two strains of Neurospora having the alleles D and d, respectively. The table shows the different patterns of octad arrangement […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Neurospora tetrad analysis
49. In Neurospora a cross between the genotypes ‘A’ and ‘a’ results in an ascus with ascospores of genotypes as shown below: Statements A to D areevents that could have […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Ideal Model System to Study Allelic Segregation in Meiosis
48. Segregation of alleles can occur either at anaphase I or anaphase II of meiosis. Which one of the following is an ideal model system for identifying the stage at […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Pedigree LOD Score
47. A pedigree shown below depicts that the individual l-I is heterozygous for a dominant disease allele D and for molecular markers MI/M2. The paternal molecular markers present in the […]
