Endosperm of flowering plants is

Endosperm of flowering plants develops from

Endosperm of flowering plants develops from

Endosperm in Angiosperm (flowering plants) is

Endosperm in Angiosperm (Flowering plants) is or The endosperm of Brassica is

What would be the number of chromosomes respectively in the cells of aleurone layer and endosperm in a flowering plant species with 12 chromosomes in its egg cell ?