The triploid nucleus in the megaspore divides to produce endosperm, which provides the plan embryo in the seed with food.
The nucleus controls all cell activities including how the cell grows develops and divides
13 meiosis in 2n mmc to produce 52 pollen grains and 50 meiosis in 4n megaspore mother cell to produce 50 egg cells & embryo sacs in diffent ovules. The total of these meiosis divisions comes to 63.
The megaspore mother cell undergoes meiosis to produce four haploid megaspores, while the microspore mother cell undergoes meiosis to produce four haploid microspores. This division results in the formation of haploid spores that will develop into gametophytes in plants.
Most of the activity occurs in the middle of the cell itself.
A megaspore mother cell of tobacco with a diploid number of 48 chromosomes will have twice that number, so there would be 96 chromosomes. During meiosis, this number will be halved to produce haploid megaspores.
The gymnosperms produce megaspores and microspores. A microspore is the male spore and megaspore is the large female spore. The microspore undergoes mitosis to produce the multicellular male gametophyte. These male gametophytes are the pollen grains that are contained inside short pollen cones. The megaspore is the large female spore that undergoes mitosis to produce the multicellular female gametophyte that is housed in a large female cone.
The nucleus.
the division of a cell's nucleus.
Asexual reproduction.
Binary fission - single cell divides to produce two offspring Multiple Fission - single cell divides to produce more than two offspring
The generative nucleus divides mitotically to produce two sperm nuclei. One of those will fertilize the egg to produce the zygote, and the other will fuse with the two polar nuclei in the embryo sac to produce the endosperm in a process called "double fertilization".
fibroblasts