Stages of Development
What is the first cell formed after fertilization called?
Answer: Zygote
In which type of development does the baby look like a small adult?
Answer: Direct development
What process causes one cell to become many smaller cells?
Answer: Cleavage
What stage comes after the egg in a frog’s development?
Answer: Tadpole
True or False: All animals go through metamorphosis.
Answer: False
What do we call the stage where a hollow ball of cells is formed?
Answer: Blastula
What is the name of the baby stage that looks different from the adult?
Answer: Larva
Which layer formed during gastrulation becomes the skin and brain?
Answer: Ectoderm
What is the larva of a butterfly called?
Answer: Caterpillar
What does "ontogeny" mean?
Answer: The development of an individual organism
During which stage do the three germ layers form?
Answer: Gastrulation
Which type of metamorphosis includes egg, larva, pupa, and adult?
Answer: Complete metamorphosis
What is the name of the fluid-filled cavity in the blastula?
Answer: Blastocoel
Do mammals have direct or indirect development?
Answer: Direct
What does “metamorphosis” literally mean in Greek?
Answer: Change of form
What is the process of forming the nervous system called?
Answer: Neurulation
Name an animal that goes through incomplete metamorphosis.
Answer: Grasshopper
Which germ layer gives rise to muscles and bones?
Answer: Mesoderm
What type of development do most insects have?
Answer: Indirect
Which organ system forms first in vertebrate embryos?
Answer: Nervous system
What structure forms from the mesoderm and becomes the backbone?
Answer: Notochord
Why do some animals have indirect development?
Answer: To reduce competition between young and adults
What type of cells can become any cell type in the body?
Answer: Totipotent cells
What is the resting stage in complete metamorphosis?
Answer: Pupa
What field of biology studies genes during development?
Answer: Developmental genetics or Evo-Devo