Embryonic Development Concepts

Front

What is a primary factor determining an animal's complexity and its classification at the phylum level?

Back

The decisions made during its earliest stages of embryonic development.

Front

Which characteristic distinguishes sea sponges from most other animal phyla?

Back

Their cells can re-aggregate to form a complete organism after being disassociated.

Front

How many tissue layers do the most complex animals typically form during their early stages of development?

Back

Three

Front

What is the correct sequence of developmental stages immediately following fertilization in most animals?

Back

Zygote -> Cleavage -> Morula -> Blastula

Front

During gastrulation, what is the initial indentation that forms on the blastula called?

Back

Blastopore

Front

What is the primary difference in embryonic development between protostomes and deuterostomes regarding the blastopore?

Back

In protostomes, the blastopore forms the mouth, while in deuterostomes, it forms the anus.

Front

Which primary germ layer in a triploblastic organism is primarily responsible for forming the skin, nervous system, and spinal cord?

Back

Ectoderm

Front

What does "Ontogeny recapitulates Phylogeny" imply about embryonic development?

Back

The growth of an embryo mirrors the evolutionary history of its species.