Crossword puzzle clue "embryo sources"

OVUM, the female reproductive cell

the fruit of the oak tree

(Latin) the white of an egg

AMNION, (Greek) the innermost membrane enveloping the embryo of reptiles, birds and mammals

relating to an amniote, a vertebrate that develops an amnion during the embryonic stage

the protoplasmic part of an ovum, distinguished from the yolk

a detailed plan of work to be done