Four different steps that occur during meiosis are given in the following list. (i) Complete separation of chromatids (ii) Pairing of homologous chromosomes (iii) Lining up of paired chromosomes on equator (iv) Crossing over between chromatids Select the correct sequential arrangement of the steps.
Number of pairs of homologous chromosomes, no of chromatids and number of centromeres respectively
Which of the following correctly shows a pair of homologous chromosomes at the start of meiosis?
Assertion: Crossing over leads to recombination of genetic material on the two chromosomes. Reason: Crossing over is the exchange of genetic material between two homologous chromosomes.
Given diagram shows a pair of homologous chromosomes during meiosis Maximum crossing over will occur between genes
Which of the following is correct about bivalent? (i) Bivalents are tetrads. (ii) A bivalent means 4 chromatids and 2 centromeres. (iii) One bivalent consists of 2 homologous chromosomes. (iv) Bivalents form in zygotene.
Assertion : Pairing and separation of pair of chromosomes would lead to segregation of a pair of factors they carried Reason : Two alleles of a gene pair are located on similar sites on non-homologous chromosomes
MBD PUBLICATION-Cell cycle and division
-QUESTION BANK
