Ap Bio Chapter 41 Vocabulary

81562836	direct development	where the newborn is born as as miniature adult and goes through minor sexual changes
81562837	indirect development	the juvenile animals differs significantly from the adult
81562838	yolk	a small amount of food reserve in an egg
81562839	larva	sexually immature form of an animal
81562840	metamorphosis	a revolutionary body form and then become sexually mature adults
81562841	amniotic egg	fully terrestrial vertebrate life was not possible until the evolution of the shelled amniotic egg. this is where the embryo is protected in liquid a filled space and develops in there.
81562842	cleavage	a series of mitotic divisions of the large fertilized egg cell or zygote
81562843	morula	a solid ball of small cells divided down the middle creating 2 diploid halves
81562844	blastula	a hollow structure with cells surrounding the outside and fluid on the inside
81562845	blastopore	an indentation that forms on the outside of the blastula causing the next stage gastrula to form
81562846	gastrulation	the cell migration and differentiation that produces a three-layered embryo and results into a gastrula
81562847	organogenesis	gradually the ectoderm, mesoderm and endoderm rearrange themselves into the organs characteristic of the animal's species
81562848	endoderm	cells of enlarging dimple, destined to become the digestive tract and associated organs
81562849	ectoderm	the cells remaining on the outside, which will form the epidermis of the skin and the nervous system
81562850	mesoderm	some cells migrate between the endoderm and ectoderm forming a third final layer
81562851	development	the process by which an organism proceeds from fertilized egg through adulthood
81562852	differentiation	the specialization of embryonic cells into different cell types such as muscle cells, brain cels and so on
81562853	induction	the process by which specific cells are stimulated to follow a specific development path
81562854	homeoboxes	short sequences of DNA found within larger genes