30. In which of the following cases will a single Barr body be seen? b. xXX ?.??

Question

30. In which of the following cases will a single Barr body be seen? b. xXX ?.?? e. both "a" and "d Sometimes a part of the genome is transcribed to RNA then reverse transcribed back to DNA and gets inserted into a new chromosome. This is known as a(n) 31. a. inversion. b. duplication. c. deletion. d. translocation. e. transposable element of the retrotransposon type. 32. When a chromosomal rearrangement such as an inversion occurs placing a known gene into or next to a heterochromatin region, the gene's expression a. will turn on b. may be amplified c. may cease d. none of the above 3. When a crossover occurs within the inversion loop of a pericentric inversion each recombinant chromatid will have a. a single centromere. . a duplication of one region a deletion different from the one of dunlicatinn

Explanation / Answer

30.The option e would be correct as no the Barr body present would be equal to number of X chromosome present minus 1. In XX so there will be 1 barr body, Similarly in XXY one barr body would be present.

31)The option e is correct in this case.Transposable element of the retrotransposon type.First it is transcribed into RNA then reverse transcribed into DNA by the enzyme reverse transcriptase and get inserted into new chromosome and hence increasing the copy number.

32)The option c would be correct as whenever a gene or segment is translocated to the hetrochromatin region of the chromosome the transcription of the gene stops.It ceases because it is transcriptionally inactive region.

33) Can't answer this because couldn't read the full parts.

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