What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells?
63
84
21
21
A.
63
The outermost cell layer of the endosperm (3n) of seed is called aleurone layer. Since the cells of aleurone layer are triploid, the number of chromosomes would be = 63, as root tip cells (2n) has 42 chromosomes.
Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres
metaphase I
metaphase II
anaphase I
anaphase I
In S - phase of the cell cycle
amount of DNA dobles in each cell
amount of DNA remains same in each cell
chromosome number is increased
chromosome number is increased
Select the correct option with respect to mitosis
Chromatids start endoplasmic
Golgi complex and endoplasmic reticulum are still visible at the end of prophase
chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase
chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase
In human females, meiosis-II is not completed until?
puberty
fertilization
uterine implantation
uterine implantation
At metaphase, chromosomes are attached to the spindle fibres by their
satellites
Secondary constrictions
Kinetochores
Kinetochores
A somatic cell that has just completed the S phase of its cell cycle, as compared to gamete of the same species, has
twice the number of chromosomes and four times the amount of DNA
same number of chromosomes but twice the amount of DNA
twice the number of chromosomes and four times the amount of DNA
twice the number of chromosomes and four times the amount of DNA
During which phase (s0 of the cell cycle, the amount of DNA in a cell remains at the 4C level if the initial amount is denoted as 2C?
Go and G1
G1 and S
Only G2
Only G2
Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?
Prophase-I during meiosis
Prophase-II during meiosis
Prophase of mitosis
Prophase of mitosis
During gamete formation, the enzyme recombinase participates during
metaphase - I
anaphase-II
prophase-I
prophase-I
