GPB MCQ Quiz 177 for ICAR JRF/SRF/ARS Exam Preparation

Lonley, 1927 and Randolph, 1928 were first reported B chromosome in

A) Maize

B) Drosophila

C) Rice

D) None of the above

Explanation: B chromosomes were first reported in rice by Lonley (1927) and Randolph (1928).

The meiotic behaviour of B chromosomes is studied during

A) Zygotene stage

B) Pachytene stage

C) Leptotene stage

D) None of the above

Explanation: B chromosomes are best studied cytologically during the pachytene stage of meiosis.

Darkly staining region of chromosomes during interphase, usually inactive in transcription, found near centromere and telomere is

A) Euchromatin

B) Heterochromatin

C) Both

D) None of the above

Explanation: Heterochromatin is densely staining, transcriptionally inactive, and found near centromeres and telomeres.

Loss of segment from a chromosome is called

A) Tandem

B) Deletion

C) Duplication

D) None of the above

Explanation: Deletion involves loss of a chromosomal segment.

One way or reciprocal exchange of segments between non-homologous chromosomes is called

A) Translocation

B) Tandem

C) Deletion

D) None of the above

Explanation: Translocation is the exchange of segments between non-homologous chromosomes.

At anaphase movement of two normal chromosomes towards one pole and that of two translocated chromosomes to another pole is called

A) Reverse displaced

B) Alternate segregation

C) Tandem

D) None of the above

Explanation: Alternate segregation describes the anaphase pattern of translocated chromosomes moving to opposite poles.

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