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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 […]

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) […]

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 […]

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 […]

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 […]

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 […]

19. In a heterozygous individual for a given gene, if a crossing over has occurred between the gene locus and the centromere of the chromosome, the segregation of the two […]

18. In Drosophila males, where no recombination occurs, segregation of the two alleles of a gene occurs at which stage of cell division? (1) Diplotene         (2) Anaphase I (3) Anaphase […]

17.  In Drosophila melanogaster males, homologous chromosomes pair and segregate during meiosis but crossing over does not occur. At which stage of meiosis does segregation of 2 alleles of a […]