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 […]
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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 […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Why recombination makes siblings so different
22. Two siblings who inherit 50% of the genome from the mother and 50% from the father show lot of phenotypic differences. Which one of the following events during gametogenesis […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Metaphase I arrangement that best explains the law of independent assortment
21. Which of the following representations of chromosomal arrangement in meiotic metaphase I best explains the Law of Independent Assortment? Concept: independent assortment and metaphase I Consider a dihybrid AaBbAaBb where A/a […]
CSIR NET Life Science Previous Year Questions and Solution on Genetics
Chromosome arrangement at metaphase I when gametes AB, Ab, aB, ab occur equally
20. If all four gametes AB, aB, Ab and ab are formed in equal probability. Then arrangement of chromosomes at metaphase-I of meiosis will be Concept Genotype: AaBb. Two homologous chromosomes […]
