Melosis is a special type of cell division necessary for the production of sex cells (gametes) for the purpose of sexual reproduction. 2N cell (diploid). N is the haploid number of chromosomes. Each chromosome is replicated. DNA replication precedes meiosis. If genetic mistakes (mutations) occur here, they will be passed on (inherited by the offspring). Crossing over has occurred. Meiosis involves a single chromosomal duplication followed by two successive nuclear divisions, and it halves the diploid chromosome Homologous chromosomes pair up. The pairs are separated. number. An overview of meiosis is shown on the right. Meiosis occurs in the sex organs of plants and animals. An intermediate cell forms with a replicated copy of each chromosome. Meiosis produces variation During meiosis, a process called crossing over may occur when homologous chromosomes may exchange genes. This further adds to the variation in the gametes. Chromatid The chromosomes line up again. This time the chromatids ate separated. Meiosis is an important way of introducing genetic variation. The assortment of chromosomes into the gametes (the proportion from the father or mother) is random and can produce a huge number of possible chromosome combinations. Gametes (N, haploid) form with one copy of each chromosome 1. (a) What is the purpose of meiosis? (b) Where does meiosis take place?

2 only

Which stage of meiosis involves the separation of homologous pairs of chromosomes?     anaphase II   metaphase II   prophase I   anaphase I Gametic meiosis, where the haploid phase is unicellular and the diploid phase is multicellular, is characteristic of     fungi   animals   bacteria   plants

Imagine a precursor germ cell (which will become a sperm or egg cell) from a diploid organism. Before the cell undergoes meiosis, it has a total of 40 chromosomes. Which of the following are true for this cell? Select all that apply The value of n is 40 After the first meiotic division, the cells will be haploid After the second meiotic division, there will be four cells When meiosis is complete, the sperm/egg will have 20 chromosomes

In regards to MEIOSIS, give the order of the following events in terms of chromosome number.   Question 8 options:   meiosis 2 and cytokinesis   a total of four cells, each containing 23 chromosomes   one cell containing 46 chromosomes   meiosis 1 and cytokinesis   one cell containing 92 chromosomes   two cells containing 46 chromosomes

Which of the following differentiates meiosis from mitosis? mitosis is used for the repair of cells, whereas meiosis creates cells for sexual reproduction.   In mitosis four identical daughter cells are produced, whereas two genetically different cells are produced in meiosis   meiosis is a form of asexual division, whereas mitosis is a form of sexual division   mitosis occurs in prokaryotic cells, whereas meiosis occurs in eukaryotic cells

All of the following make melosis different from mitosis EXCEPT O chromosome number is reduced by half in melasis. O meiosis comprises two divisions. O pairing of homologous chromosomes usually only occurs melosis. O resulting cells from meiosis are genetically different from the parent cell. O meiosis lacks a preceding S phase