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35. A gene inherited from mother is not expressed the offspring, but the same gene when inherited from father is expressed in both male and female offspring. This phenomenon is […]

34. In knockout mice experiment was performed for germline transmission of gene A, null allele from a male chimera shows retarded growth of all mutant heterozygotes. On inbreeding animals produced […]

33. The pattern of genomic imprinting is maintained from one generation to another by (1) Phosphorylation of DNA (2) Methylation of DNA (3) Acetylation of DNA (4) Glycosylation of DNA […]

32. Dosage compensation in mammal females is achieved by (1) Methylation of one X chromosome (2) Hyper activation of one X chromosome (3) Elimination of one X chromosome (4) Hypoactivation […]

31. Dosage compensation in drosophila is achieved by- (1) Selective elimination of maternal X chromosome (2) Heterochromatization of paternal X chromosome (3) Hyperactivation of maternal X chromosome (4) Hyperactivation of […]

30. Dosage compensation occurs in- (1) Insects and mammals (2) Reptiles and mammals (3) Reptiles and Aves (4) Insects and reptiles Dosage compensation is a genetic mechanism that equalizes the […]

29. Dosage compensation in drosophila is mediated by (1) Inactivation of one X chromosome in female (2) Hyper activation of one X chromosome in male (3) Hypo activation of both […]

28. In mammals effective dosage of genes of two sexes is made equal by- (1) Elimination of X chromosome in females (2) Hyper activation of one X chromosome in males […]

27. In human females there is inactivation of one X chromosomes for dosage compensation due to- (1) Methylation           (2) Acetylation (3) Phosphorylation    (4) Formylation In human females, X chromosome inactivation […]

26. In a plant r+ and a+ genes encode for a regulatory and a structural protein, respectively. These genes are responsible for blue color of flower. Mutation in either of […]