Question

Match the event with the correct phase of MEIOSIS [Choose) Tetrads of homologous chromosomes align on the middle plane of the cell. The orientation of the tetrads on the middle plane is random. < Homologous chromosomes separate; move to opposite poles. [Choose ] < [Choose] Homologous chromosomes associate, crossing over occurs, chromosomes condense. < Two cells formed; each has one of each duplicated chromosome. [Choose ] Four cells formed; each cell has one of each unduplicated chromosome. [Choose) [Choose ] Chromatin condenses to allow the chromosomes to move more easily around the cell. The cell elongates during this stage. [Choose ]

Answer 1

1. metaphase 1

2. anaphase 1

3. Pachytene of prophase1

4. cytokinesis 1

5. cytokinesis 2

6. diakinesis of prophase1

7 Anaphase1

.

Meiosis:

a. Meoisis maintains the definite and constant number of chromosomes in sexually reproducing organisms

b. Meiosis provides an opportunity for exchange of genes through crossing over causing genetic variations among the species which are the raw materials for eveolutionary process

Meiosis involves two successive divisions forming four daughter cells, each having haploid number of chromosomes. In first meiotic division, reduction in the chromosome number occurs without separation of chromatids. The stages involved are prophase I (WITH 5 SUBSTAGES, LEPTOTENE, ZYGOTENE, PACHYTENE, DIPLOTENE AND DIAKINESIS). In the second meiotic division , separation of chromatids of chromosomes occurs. Four daughter cells with haploid chromosomes are formed during spermatogenesis in males and oogenesis in females. The stages of second meiotic division are Prophase II, metaphase II, anaphase II and telophase ii; these are similar to those of simple mitotic division.