Variations in the progression of a developing oocyte, from diakinesis to metaphase (meiosis I), in response to a signal compared to control animals. Meiotic maturation is accompanied by nuclear envelope breakdown (germinal vesicle breakdown), cytoskeletal rearrangement and meiotic spindle assembly.
Variations in the progression of the immature germ cell over time, from its formation from precursors to the mature structure (gamete) compared to control.