In synapsis two homologous chromosomes are connected at

• centromeres

• chromomeres

• telomeres

• none of these

During meiosis crossing over occurs at

• pachytene

• zygotene

• leptotene

• diakinesis

Match the item in column I with those in column II and the choose the correct answer.

• A- 1; B- 2

• A- 2; B- 3

• A- 3; B- 4

• A- 4; B- 1

The stage of cell cycle when cell has undergone differentiation is :

• G₀

• G₁

• G₃

• G₄

Spindle fibres of mitotic cell are made up of

• tubulin

• actin

• myosin

• collagen

Which of the followings does not occur in the interphase of eukaryotic cell division?

• Increase of ATP synthesis

• Increase of DNA synthesis

• Increase of RNA synthesis

• Reduction in cell size

In cell cycle, during, which phase chromosomes are arranged in equatorial plate ?

• Metaphase

• Anaphase

• Telophase

• Prophase

Stages in proper sequence of prophase- I are

• zygotene, leptotene, pachytene, diakinesis

• leptotene, zygotene, pachytene, diplotene and diakinesis

• eptotene, pachytene, zygotene, diakinesis and diplotene

• diplotene, diakinesis, pachytene, zygotene and leptotene

During meiosis crossing over occurs between which part of homologous chromosome ?

• Sister chromatids

• Non-sister chromatids

• Genes

• Alleles

During mitosis nuclear membrane disappears at

• early prophase

• late prophase

• metaphase

• anaphase