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?

• G_o and G₁

• G₁ and S

• Only G₂

• Only G₂

12.

In human females, meiosis-II is not completed until?

• puberty

• fertilization

• uterine implantation

• uterine implantation

During gamete formation, the enzyme recombinase participates during

• metaphase - I

• anaphase-II

• prophase-I

• prophase-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

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

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

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

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

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

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

• satellites

• Secondary constrictions

• Kinetochores

• Kinetochores