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A Drosophila mutant (line A) with vestigial wings is isolated in a laboratory. The vestigial wing phenotype was observed to be recessive and mapped to gene ‘X’. Three other laboratories […]

44. A researcher exposed Drosophila larvae to 370C during their growth. One of the adult flies that emerged had a crossveinless phenotype. Crossveinless is a known mutant in Drosophila. When […]

The individuals considered in this question are having two haploid sets of autosomes and no Y. chromosome. The X:A ratio of the individuals, the type of organisms chosen, their primary […]

42. A male mouse cell line has a large translocation from X chromosome into chromosome 1. When a GFP containing transgene is inserted in this chromosome 1 with translocation, it […]

41. In context of DNA methylation, which one of the following statements is FALSE? (1) Generally, methylation occurs at the 3rd carbon position of cytosine and converts it to 3-methyl […]

40. Criss-cross inheritance is shown by- (1) Sex linked traits (2) Sex influenced traits (3) Sex limited traits (4) Autosomes Criss-cross inheritance is shown by sex-linked traits, specifically genes located […]

Gene ‘A’ in mouse is needed for its normal growth [normal size). Mouse strains with deletion in gene ‘A’ (Adel) have been developed. When the following cross is made …..AdelA […]

38. Which one of the following statements is correct? (1) Epigenetic memory depends on DNA acetylation by trithorax group of proteins (2) An epigenetic change could be inherited from a […]

37. A mouse carrying two alleles of insulin-like growth factor II (igf2) is normal in size; whereas a mouse that carries two mutant alleles lacking the growth factor is dwarf. […]

36. Following statements were made about imprinting in the human genome. A. Imprinting control centre (lC) harbors part of the SNRPN gene. B. Imprinting of genes in an individual cannot […]