Overview of Animals exam Flashcards

Organisms composed of multiple cells.

Organisms that obtain their nutrients by consuming other organisms.

Organisms whose cells contain a nucleus and other organelles enclosed within membranes.

Protostomes develop the mouth from the blastopore, while deuterostomes develop the anus from the blastopore.

A series of rapid mitotic divisions that lead to the formation of a blastula.

Ectoderm, mesoderm, and endoderm.

Organisms that nourish the embryo inside the parent and give birth to live offspring.

Organisms that lay eggs, with embryos nourished by yolk.

A hollow ball of cells formed during early embryonic development.

The process during embryonic development that forms the three germ layers.

Genes that control the development of body plans in animals.

Forms the outer layer of the body, including skin, brain, and nerves.

The middle germ layer that forms muscles, bones, and the circulatory system.

The inner germ layer that forms the lining of the digestive tract and other internal organs.

A type of cleavage where the plane of cell division is parallel or perpendicular to the vertical axis of the embryo.

A type of cleavage where the plane of cell division is diagonal to the vertical axis of the embryo.

Cleavage where cells can develop into any type of cell in the organism.

Cleavage where cells have a predetermined fate and will differentiate into specific cell types.

A body cavity completely surrounded by mesoderm.

A body cavity that is partially lined with mesoderm and endoderm.

An organism that lacks a body cavity.

A body plan where the organism can be divided into two equal halves along one plane.

A body plan where the organism can be divided into similar halves by multiple planes passing through the central axis.

The concentration of nervous tissue at the anterior end of an organism, forming a brain.

A primitive backbone structure that forms from the mesoderm.

A hollow structure that develops into the brain and spinal cord.

The division of the body into repeated sections or segments.

Animals in which the blastopore becomes the mouth.

Animals in which the blastopore becomes the anus.