This about apomixis is true:

The correct option is All of the above.

Let us analyze each statement step-by-step to understand why they are all correct:

1. There is no fertilization involved in both apomixis and parthenocarpy:
- Apomixis is a form of asexual reproduction in plants that mimics sexual reproduction but occurs without fertilization, resulting in seed formation.
- Parthenocarpy refers to the development of fruit without fertilization, which typically results in seedless fruits.
Since fertilization is absent in both processes, this statement is correct.

2. Apomixis produces genetically identical mother cells:
- Because apomixis bypasses the processes of meiosis (in recurrent apomixis/apospory) and syngamy (fertilization), the offspring or resulting embryonic cells are genetic clones of the maternal parent plant.
Therefore, it produces genetically identical mother/maternal-line cells, making this statement correct.

3. Apomixis is observed in angiosperms and gymnosperms:
- Apomixis is a well-documented phenomenon occurring in many families of flowering plants (angiosperms, such as Asteraceae and Poaceae) as well as in certain non-flowering seed plants (gymnosperms).
Thus, this statement is also correct.

Since all three individual statements are scientifically accurate, the correct choice is indeed All of the above.