Biology Test 19...

Kinetochore is a site for attachment of spindles. These spindles are made up of :-

Which of the following marks the phase of DNA replication and chromosome duplication ?

Select the odd one -

Which of the following is a event of pachytene?

A stage in cell division is shown in the figure. Select the answere which gives correct identification of the stage with its characteristics.

During cell cycle, time taken for the completion of M-phase is:-

In a root tip cell, there are 24 chromosomes. How many chromosomes will be present in the following stages :-

(A) In G₁ phase
(B) After S phase
(C) After M phase

Initiation of assembly of mitotic spindle, appearance of two chromatids, initiation of condensation process are marked features of:-

Which of the following is/are correct with respect to reduction division ?

(A) Diakinesis is marked by appearance of chiasmata

(B) Duplication of centroiles occurs in anaphase-I

(C) Sister chromatids of homologous chromosomes exhibit crossing over

(D) Interkinesis is short lived phase which is followed by prophase-II, a much simpler phase than prophase-I

In which phase of mitosis the number of chromosomes in a diploid cell become four times as compared to a haploid cell?