Animal Development Flashcards
Stage and process that is first in the early steps of embryogenesis?
The Zygote stage and the cleavage process
Define ontogeny
Study of development from conception until death
Define embryogenesis
Growth of young from zygote to where nutrition from the mother is exhausted and the young is capable of ingesting food
What is a larva?
Larvae. An intermediate and immature stage/ for during embryogenesis
What doesn’t look like it’s adult form?
Larva
A single, fertilized egg
Zygote
Morula is_____
A cluster of cells produced by mitotic divisions
Cleavage is defined as_____
conversion of unicellular zygotes to multicellular embryos (morula) through repeated mitosis and little to no growth
What is the hollow shape of cells in a blastula called?
Blastoemeres
How does a morula develop into a blastula?
By the process of cavitation, which is the hollowing out of the morula to a hollow ring of cells. Continuing cell division is happening as well.
A gastrula is a(n) ______ with how many germ layers?
early embryo, 3 germ layers.
Define gastrulation
Process that develops the three embryonic tissues that might be present from the blastula, and situates in their appropriate positions.
What is a cell of a morula or a blastula called?
Blastomere
The initial cavity within a blastula is described as what?
Blastocoel
Blastopore is where cells do what?
It is the site where cells start to move into the blastocoel during the gastrulation process.
