Tag: CSIR NET Life Science Previous Year Questions and Solution Genetics

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 […]

25. A plant that produces disc-shaped fruit is crossed with another plant that produces long fruit. All the F1 plants gave disc-shaped fruits. When the F1 were intercrossed, F2 progeny […]

24. In a mammal, coat colour is governed by gene B, The coat colour is either black or brown, depending on whether the genotype is BB or Bb. It is […]

23. Two Yellow mice with straight hair were crossed and the following progeny was obtained: 1/2 Yellow, straight hair 1/6 Yellow, fuzzy hair 1/4 gray, straight hair 1/12 gray, fuzzy […]

22. In a flower species, light pink locus is hypostatic to pigment development locus. R is for pigment development and W for light pink. The recessive allele (w) in light […]