The main events in meiosis During the first division, chromosomes pair and sections of are exchanged between non-sister chromatids as a result of crossing over (prophase I). The nuclear membrane fragments and pairs of homologous chromosomes become aligned on the . One chromosome of each pair is lined up on either side of the equator (metaphase I). The pairs of chromosomes are separated and pulled apart (anaphase I) to either pole to form the first two daughter nuclei (telophase I). divides the cytoplasm and each daughter cell now contains the number of chromosomes. During the second division, the nuclear membrane fragments and individual chromosomes composed of 2 sister become aligned on the equator of the spindle (metaphase II). The pairs of chromatids are separated and pulled apart (anaphase II) to either to form daughter nuclei as the nuclear membranes reform around the new nuclei (telophase II). Cytokinesis divides the two cells into fou

Cytokinesis divides the two cells into four daughter cells.

Explanation:

Meiosis is a type of cell division in which a single cell is divided into four daughter cells. These daughter cells are haploid i. e. half number of chromosomes. This type of cell division occurs only in sex cells of male and female organisms. There are two phases of meiosis. In meiosis 1, a single cell is divided into two daughter cells while in meiosis 2, these two daughter cells again divided into four daughter cells.

1) gene flow

- it is described as the transfer of genes from one population to another population so that frequency of gene is increased.

-a zebra migrates to join a different herd of zebras.

2) natural selection

- a mechanism of evolutionary change in which individuals with advantageous traits survive and reproduce whereas the others ( those that can not adapt) eliminate from the population.

-competition for sunlight leads to taller trees.

3) mutation

- permanent change in the nucleotide sequence of dna ( genetic material) that could have harmful or useful consequences.

-the dna of a snake changes to make its venom stronger.

4) genetic drift - it is a random phenomenon ( that occurs by chance such as fire) that results in change in the gene frequency in a small population.    

-a grassfire randomly sweeps through a population of buffalo and kills most of the animals.

explanation: