The total is 12 long, 6 medium and 6 short chromosomes. The same numbers were found by De Mol in the root-tips. pairing with 8 similar chromosomes at the first meta- phase in the pollen-mother-cell.
Do pollen cells have 12 chromosomes?
Each of the three haploid nuclei in the germinated pollen grain must contain 12 chromosomes, and each of the 8 nuclei within the embryo sac contain 12 chromosmes. A triploid endosperm cell inside a seed must contain 36 chromosomes (3 x 12 = 36).
Is pollen mother cell haploid or diploid?
Pollen mother cell (PMC) is also called Microspore mother cell(MMC). Yes, these pollen mother cells are actually sporogenous tissues. These are the diploid cells found in the anther which give rise to four haploid micropores through meiosis, each of which develops into male gametophyte (pollen grains).
What are pollen mother cells?
: a cell that is derived from the hypodermis of the pollen sac and that gives rise by meiosis to four cells each of which develops into a pollen grain.
Is pollen mother cell and Sporogenous tissue same?
No, Sporogenous tissue is a group of cell which differentiates into microspore mother cell or pollen mother cell. Sporogenous tissue is the compactly arranged homogenous cell in the microsporangium found in young anther. … Each microspore mother cell undergoes meiosis and gives rise to haploid microspore.
Is a stigma male or female?
The male parts of the flower are called the stamens and are made up of the anther at the top and the stalk or filament that supports the anther. The female elements are collectively called the pistil. The top of the pistil is called the stigma, which is a sticky surface receptive to pollen.
How many male gametes can 4 pollen mother cells produce?
Each of the pollen grain is encased in a wall which is a thick protective sporopollenin and it dries to a desiccated state for dispersal. The microgametophyte in many species is mature only after pollen germination. Thus, a pollen mother cell generates four gametes. Hence, the correct answer is option (A).
How is pollen mother cell formed?
microspore mother cell (microsporocyte)
A diploid cell in plants that divides by meiosis to give rise to four haploid microspores (seesporophyll). In flowering plants microspore mother cells are formed within the pollen sacs of the anthers by mitosis; the microspores they produce develop into pollen grains…. …
How is pollen formed?
Pollen is produced by cone-bearing and flowering plants as part of their reproduction process. In cone-bearing (gymnosperms) plants, pollen is produced in pollen cones. Flowering plants (angiosperms) produce pollen in the anthers within the flower. … The grains of pollen must be transferred from the anther to the stigma.
Is Microsporangium and anther same?
angiosperms. …in terminal saclike structures (microsporangia) called anthers. The number of stamens comprised by the androecium is sometimes the same as the number of petals, but often the stamens are more numerous or fewer in number than the petals.