1. Mature diploid sporophyte undergoes meiosis to produce haploid unicellular microspores and megaspores. 2. The microspore undergoes mitotic divisions to produce the male gametophyte, which is composed of a haploid vegetative cell and haploid generative cell.
Are the archegonia and antheridia haploid or diploid think about which generation produces them?
produced in archegonia (sing., archegonium), and sperm are produced in antheridia (sing., antheridium). These haploid gametes are formed by mitosis. The gametes fuse, usually by the entrance of the sperm into the archegonium, forming a diploid zygote, the first stage of the diploid sporo- phyte generation.
Are Gametophytes produced by meiosis or mitosis?
Diploid sporophyte cells undergo meiosis to produce haploid spores. Each spore goes through mitotic divisions to yield a multicellular, haploid gametophyte. Mitotic divisions within the gametophyte are required to produce the gametes. The diploid sporophyte results from the fusion of two gametes.
Will Megaspores divide to form the female gametophyte or the sporophyte?
The megasporangium contains megaspore mother cells, which divide by meiosis to produce haploid megaspores. A megaspore develops into a female gametophyte containing a haploid egg. A new diploid sporophyte is formed when a male gamete from a pollen grain enters the ovule sac and fertilizes this egg.
Are Archegonia haploid?
Terminology. The female gametangium, a haploid structure that produces female gametes or eggs. The male gametangium, a haploid structure that produces numerous male gametes or sperm. The lineage of green plants that retain a diploid embryo on the parent’s body until it develops into a sporophyte.
Are zygotes haploid or diploid?
The zygote is endowed with genes from two parents, and thus it is diploid (carrying two sets of chromosomes). The joining of haploid gametes to produce a diploid zygote is a common feature in the sexual reproduction of all organisms except bacteria.
Is mitosis used for growth and repair?
The process of mitosis generates new cells that are genetically identical to each other. Mitosis helps organisms grow in size and repair damaged tissue.
Where does mitosis occur in the body?
Cell division by mitosis occurs in all human body cells except the gonads (sex cells). During mitosis, the DNA is exactly copied and a new daughter cell created with the same number of chromosomes as the parent cell, ie 46.