Apomixis in plants means the development of a plant:

In agamospermy,the embryo sac is diploid because it is formed without meiosis. Such an embryo sac may develop from:

$A$ : Tetraploid gametophyte can be produced from tetraploid sporophyte by means of apogamy. $R$ : Apogamy involves fertilisation,not meiosis.

Can an unfertilised,apomictic embryo sac give rise to a diploid embryo? If yes,then how?

Statement-$X$: Apomixis is seen in a few flowering plants such as some species of $Asteraceae$ and grasses.
Statement-$Y$: Apomixis is a form of asexual reproduction that mimics sexual reproduction.
Statement-$Z$: In some species of apomictic seeds,the diploid egg cell is formed without reduction division.

Which of the following can be expected if scientists succeed in introducing an apomictic gene into hybrid varieties of crops?