During meiotic division, the
homologous chromosomes are seperated
linkage is disturbed
homologous chromosomes do not segregate
All of the above
A.
homologous chromosomes are seperated
Meiotic division occurs in reproductive system or germ cells. After meiosis, four haploid cells are present which are not identical to their parents. Homologous chromosomes form bivalent by pairing and each of them is seperated. They move towards the opposite poles of the spindle fibres. Each daughter cell receives a haploid set of chromosomes.
Select the wrong statement :
Cell wall is present in members of Fungi and Plantae
Mushrooms belong to Basidiomycetes
Mitochondria are the powerhouse of the cell in all kingdoms except Monera
Pseudopodia are locomotory and feeding structures in Sporozoans
Post-mitotic gap phase is characterised by all, except
Synthesis of RNA and nucleotides
No change in DNA content
Synthesis of histone proteins
Growth phase of the hell
Independent assortment of gene occurs due to the orientation of chromosomes at
Metaphase-I of mitosis
Metaphase-I of meiosis
Metaphase-II of meiosis
Any phase of the cell division
The non-disjunction, in meiosis may result is extra copy of a chromosome in a sperm cell. During which phase the above phenomenon may occur?
Prophase-I, prophase-II
Prophase-I, prophase-II
Anaphase-I, anaphase-II
Anaphase-I, telophase-II
The mitotic cell cycle is divided typically into four phases; G1, S, G2 and M. Considering a mitotic cycle time of 18 hrs; the distribution of period of time (in hrs) for each of these phases will be
| G1 | S | G2 | M |
| 1 | 3 | 5 | 9 |
| G1 | S | G2 | M |
| 9 | 1 | 3 | 5 |
| G1 | S | G2 | M |
| 9 | 5 | 3 | 1 |
| G1 | S | G2 | M |
| 3 | 5 | 9 | 1 |
Which one of the following precedes re-formation of the nuclear envelope during M-phase of the cell Cycle?
Decondensation from chromosome and reassembly of the nuclear lamina
Transcription from chromosome and reassembly of the nuclear lamina
Formation of the contractile ring and formation of the phragmoplast
Formaltion of the contractile ring and transcription from chromosomes
Viruses that infect bacterial multiplication and cause their lysis, are called
Lysozymes
Lipolytic
Lytic
Lysogenic
During the G1- phase of cell division
RNA and proteins are synthesised
DNA and proteins are synthesised
cell prepares for M- phase
cell undergoes duplication
In cell cycle, during which phase chromosomes are arranged in equatorial plate?
Metaphase
Anaphase
Telophase
Prophase
