Meiosis in plants?

Question

How do plants preform Meiosis? I need help with this it's for a report for school....

Answer 1

Meiosis I
Prophase of meiosis I (prophase I) is a more elaborate process than prophase of mitosis (and usually takes much longer).
Here is a brief overview of the process. A more detailed view is provided below.

When the chromosomes first become visible they are already doubled, each homologue having been duplicated during the preceding S phase.
Result: pairs of homologous dyads each dyad consisting of two sister chromatids held together by proteins called cohesins.
Pairing: Each pair of homologous dyads align lengthwise with each other.
Result: a tetrad. (These structures are sometimes referred to as bivalents because at this stage you cannot distinguish the individual sister chromatids under the microscope.)
The two homologous dyads are held together by
one or more chiasmata (sing. = chiasma) which form between two nonsister chromatids at points where they have crossed over.
the synaptonemal complex (SC), a complex assembly of proteins (including cohesins)
At metaphase I, microtubules of the spindle fibers attach to the

sister kinetochores of one homologue, pulling both sister chromatids toward one pole of the cell;
sister kinetochores of the other homologue pulling those sisters toward the opposite pole.


Result: one homologue is pulled above the metaphase plate, the other below. The chiasmata keep the homologues attached to each other, and the cohesins keep the sister chromatids together.

At anaphase I,

the cohesins between the chromosome arms break down allowing
the chiasmata to slip apart.
Result: the homologous dyads separate and migrate toward their respective poles.
Link to discussion of the mechanism of cohesin breakdown.

Meiosis II
Chromosome behavior in meiosis II is like that of mitosis.
At metaphase II, spindle fibers attach one kinetochore of the dyad to one pole, the other to the opposite pole.
At anaphase II, the chromatids separate and (each now an independent chromosome) move to their respective poles.

Answer 2

Pretty much the same as in animals. Except that plants have a dual lifecycle...sporophyte and gametophye. The sporophyte undergoes meiosis to produce a spore which then grows into a gametophyte which produces gametes. The gametes then come together to form a zygote and a sporophyte is grown from that. As for the process it's the same for anything else that performs meiosis.

Answer 3

Examples of plant mitosis - Meristematic area of roots and stems are continuously dividing which improve the dimensions of plant. occasion of animal mitosis - the exterior cells are dividing and help in restoration of the lifeless cells by potential of changing them. For meiosis in vegetation, the products are Microsoprangium is in men Megasporangium in women Meiosis in vegetation and animals all the intercourse cells no count if be in vegetation or animals undergo meiosis

Answer 4

In biology, meiosis is the process that allows one diploid cell to divide in a special way to generate haploid cells in eukaryotes. The word "meiosis" comes from the Greek meioun, meaning "to make smaller," since it results in a reduction in chromosome number.

Meiosis is essential for sexual reproduction. It therefore occurs in most eukaryotes, including single-celled organisms. A few eukaryotes, notably the Bdelloid rotifers, have lost the ability to carry out meiosis and acquired the ability to reproduce by parthenogenesis. Meiosis does not occur in archaea or prokaryotes, which reproduce by asexual cell division processes.

During meiosis, the genome of a diploid germ cell, which is composed of long segments of DNA called chromosomes, undergoes DNA replication followed by two rounds of division, resulting in haploid cells called gametes. Each gamete contains one complete set of chromosomes, or half of the genetic content of the original cell. These resultant haploid cells can fuse with other haploid cells of the opposite gender or mating type during fertilization to create a new diploid cell, or zygote. Thus, the division mechanism of meiosis is a reciprocal process to the joining of two genomes that occurs at fertilization. Because the chromosomes of each parent undergo genetic recombination during meiosis, each gamete, and thus each zygote, will have a unique genetic blueprint encoded in its DNA. In other words, meiosis is the process that produces genetic variation.

Biochemically, meiosis uses some of the same mechanisms employed during mitosis to accomplish the redistribution of chromosomes. There are several features unique to meiosis, most importantly the pairing and recombination between homologous chromosomes, which enable them to separate from each other.