Organisms that are haploid, e.g. algae such as Volvox, Spirogyra, etc. show meiosis in the zygote. The haploid gametes fuse to produce a diploid zygote, which undergoes meiosis to produce haploid spores, which divide mitotically to produce gametophyte.
Where does meiosis take place in a haploid organism?
In the anther and the ovary, meiocytes undergo meiosis, and the resulting haploid products of meiosis are called spores. A spore undergoes a few mitotic divisions to produce a small, multicellular gametophyte.
Does meiosis occur in haploid organisms?
Haploid parents produce gametes by mitotic division to maintain the equal number of chromosomes in cells. Hence, meiosis can’t occur in haploid organisms. Meiosis can occur only in diploid organisms or in the diploid stage of their life cycle.
Where does meiosis occur in haploid and diploid cells?
In mammals, Meiosis occurs only in gamete producing cells within the gonads. During meiosis, homologous (paired) chromosomes separate, and haploid cells form that have only one chromosome from each pair.
Does meiosis occur in haploid or diploid cells?
Meiosis is where a diploid cell gives rise to haploid cells, and fertilization is where two haploid cells (gametes) fuse to form a diploid zygote.
Where does meiosis occur?
During fertilisation, two haploid gametes fuse to form one diploid cell. This will divide by mitosis to form an organism. Meiosis occurs in the testes of men and ovaries of women.
Is haploid mitosis or meiosis?
Meiosis produces 4 haploid cells. Mitosis produces 2 diploid cells. The old name for meiosis was reduction/ division. Meiosis I reduces the ploidy level from 2n to n (reduction) while Meiosis II divides the remaining set of chromosomes in a mitosis-like process (division).
What organisms are haploid?
Haploid is the quality of a cell or organism having a single set of chromosomes. Organisms that reproduce asexually are haploid. Sexually reproducing organisms are diploid (having two sets of chromosomes, one from each parent). In humans, only their egg and sperm cells are haploid.
Does meiosis occur in organisms that are diploid?
Answer: Meiosis can take place only in a diploid stage (post-zygotic stage) because the zygote is the only diploid cell in the life cycle of such organisms.
Where does meiosis occur in ovule?
In ovule, meiosis occurs in megaspore mother cell.