| In sexual reproduction, spermatocytes develop from the transformation of choanocytes, and oocytes arise from archeocytes. |
| This was first recognized more than a half century ago in cytological studies of lampbrush chromosomes in amphibian oocytes and polytene chromosomes in insects. |
| Such a system is an adequate representation for some biological cells such as for example oocytes, the inner disc representing the nucleous. |
| In both the cases, oocytes were exposed to the cytostatic chemical, nocodazole, from the time of hormonally stimulated resumption of meiosis. |
| In mammals, signals from the gonads determine whether the germ cells develop into oocytes or sperm. |
| One of the major changes that occurs during the maturation of oocytes is the accumulation of yolk protein, or vitellin. |
