Fertilization
The union of sperm and egg is called…
What is fertilization?
The first few rapid cell divisions of the zygote are called…
What is cleavage?
The fluid-filled cavity inside a blastula is called…
What is the blastocoel?
The process that forms three primary germ layers is called…
What is gastrulation?
The process where germ layers develop into organs is called…
What is organogenesis?
The structure formed immediately after fertilization, a single-cell zygote.
What is a zygote?
These are the smaller cells produced by cleavage.
What are blastomeres?
The layer of cells that surrounds the blastocoel is called…
What is the blastoderm?
The three germ layers formed during gastrulation are…
What are ectoderm, mesoderm, and endoderm?
The nervous system originates from which germ layer?
What is the ectoderm?
The type of division the zygote undergoes without growth in size.
What is cleavage?
Cleavage that results in a hollow ball of cells is called…
What is blastulation?
In mammals, this structure that implants into the uterus is called…
What is a blastocyst?
The opening formed during gastrulation in the embryo is called…
What is the blastopore?
The heart and blood vessels develop from which germ layer?
What is the mesoderm?
This is the process where the egg and sperm membranes fuse, allowing the sperm nucleus to enter.
What is sperm-egg fusion?
Cleavage in mammals that results in cells of unequal size is called…
What is holoblastic, unequal cleavage?
The two main parts of a mammalian blastocyst are the inner cell mass and…
What is the trophoblast?
The ectoderm eventually forms structures like…
What are the skin and nervous system?
The digestive and respiratory lining come from which germ layer?
What is the endoderm?
The stage when the zygote’s chromosomes combine from both parents.
What is the diploid zygote stage?
The compacted mass of cells at the end of cleavage is called…
What is a morula?
The blastula stage is important for setting up…
What is the body plan or cell differentiation?
The mesoderm gives rise to…
What are muscles, bones, and the circulatory system?
The first organ to form in vertebrate embryos is usually…
What is the heart?