71.

At metaphase, chromosomes are attached to the spindle fibres by their

• satellites

• Secondary constrictions

• Kinetochores

• Kinetochores

During mitosis ER and nucleolus begin to disappear at 

• late prophase

• early metaphase

• late metaphase

• late metaphase

Which stages of cell division do the following figures A and B represent respectively?

• Metaphase - Telophase

• Telophase - Metaphase

• Late anaphase - Prophase

• Late anaphase - Prophase

In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are

• n = 7  and x = 21

• n = 21 and x = 21

• n = 21  and x = 14

• n = 21  and x = 14

What would be the number of chromosomes in the cells of the aleurone layer in a plant species with 8 chromosomes in its synergids?

• 16

• 24

• 32

• 32

Which of the following options gives the correct sequence of events during mitosis?

• Condensation - nuclear membrane disassembly
  - crossing over - segregation - telophase

• Condensation - nuclear membrane disassembly
  -arrangement at equator - centromere
  division - segregation - telophase

• Condensation - crossing over - nuclear
  membrane disassembly - segregation -
  telophase

• Condensation - crossing over - nuclear
  membrane disassembly - segregation -
  telophase

Zygotic meiosis is characteristic of

• Marchantia

• Fucus

• Funaria

• Funaria

Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?

• Chromosomes will not condense

• Chromosomes will be fragmented

• Chromosomes will not segregate

• Chromosomes will not segregate

DNA replication in bacteria occurs

• During S-phase

• Within nucleolus

• Prior to fission

• Prior to fission

Select the incorrect match :

• Lampbrush – Diplotene bivalents chromosomes

• Allosomes – Sex chromosomes

• Polytene chromosomes – Oocytes of amphibians

• Submetacentric chromosome – L-shaped chromosomes