32. In a plant, male sterility is caused by the presence of a dominant allele for a nuclear gene (Ms). There are also lines which carry a gene whose dominant […]
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
Proportion of aabb progeny when AaBb (50 map units apart) is selfed
31. A plant of the genotype AaBb is selfed. The two genes are linked and are 50 map units apart. What proportion of the progeny will haw the genotype aabb? […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
How many different gametes can AaBbccDDEe produce?
30. How many genetically different gametes can be made by an individual of genotype AaBbccDDEe? (1) 3 (2) 5 (3) 1/4 (4) 32 Step-by-step reasoning Genotype: Aa Bb cc DD […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Probability of getting AaBBccDd from AABbccDd × aaBBccDD
29. Assuming that the A, B, C and D genes are not linked. The probability of a progeny being AaBBccDd from a corss between AABbccDd and aaBBccDD parents will be […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Calculating albino frequency in F₂ from black × albino (AAbbcc) mice
28. In the following example, 3 independently assorting genes are known to govern coat color in mice. The genotype of few of the coat colors is given below: Agouti: A-B-C- […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Probability of at least one dominant phenotype in selfed AaBbCc plant
27. Genes A, B and C. control three phenotypes which assort independently; A plant with the genotype Aa Bb Cc is selfed. What is the probability for progeny which show […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Probability of getting a sum of 9 when two dice are thrown
26. What is the probability of getting a sum of 9 from simultaneously throwing two dice? (1) 1/6 (2) 1/8 (3) 1/9 (4) 1/12 Step‑by‑step solution Total possible outcomes Each […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
What are mouse strains that differ at only one genetic locus called?
25. Two strains of mice which are genetically identical except for a Single genetic locus or region are said to be: (1) Syngenic (2) Allogenic (3) Congenic (4) […]
CSIR NET Life Science Previous Year Questions and Solution on GENE MAPPING METHODS
Meiotic events that create genetic variation: crossing over and metaphase I alignment
24. Of the following meiotic events (A) formation of synaptonemal complex (B) crossing over (C) arrangements of chromosomes at the equatorial plate at Metaphase I (D) separation of chromatids at […]
![23. Mutation is essential for genetic variation. Which one of the following events can lead to variation amongst the gametes produced by males of Drosophila melanogaster? [Crossing over does not occur in D. melanogaster males] (1) Segregation (2) Imprinting (3) Recombination (4) Independent Assortment.](https://www.letstalkacademy.com/wp-content/uploads/2025/11/23-2.png)
CSIR NET Life Science Previous Year Questions and Solution on Genetics
How Drosophila males generate genetically different gametes without crossing over
23. Mutation is essential for genetic variation. Which one of the following events can lead to variation amongst the gametes produced by males of Drosophila melanogaster? [Crossing over does not […]
