Definations / Explanation

$1.$ apomixis

$2.$ polyembryony

$A$ : Apomictic embryo is asexual mode of reproduction.
$R$ : It prevents the segregation of traits.

Embryo sacs of some apomictic species appear normal but contain diploid cells. Suggest a suitable explanation for the condition.

Despite high level of heterozygosity, the progeny derived from seed of a cross pollinated plant was found to be completely uniform. One reason for this may the phenomenon of

The most significant value of vegetative propagation is that