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1. Another name for a fertilized egg is a _______________________________.

2. Name the cell division process (starts with the letter “m”) in which the fertilized eggs develop into a multicellular embryo (ie. 2 cell, 4 cell, 8 cell, etc). ______________________
3. The embryonic stage referred to as a hollow ball of cells is called the ___________________________ and its central cavity is the ________________________________.

4. Name the embryonic stage where cells are moving inward toward the central cavity (invagination) forming the beginning of the primitive digestive system or archenteron (arch (G) = primitive; enteron (G) = gut)). _________________________________

5. Stoma is (G) meaning mouth and deutero is (G) for 2nd. Therefore, deuterostomes are organisms in which the 2nd embryonic opening becomes the _______________________ of the organism and the 1st opening or blastopore becomes the ______________________.

6. Name the 2 major phyla that are deuterostomes: _________________________________ and ______________________

7. Proto is (G) for first; therefore, in organisms that are protostomes the 1st opening becomes the __________________. Arthropods, 80% of animals, are protostomes.

8. Ectoderm develops into the ________________________ and _____________________; mesoderm develops into ____________________ and endoderm develops into__________________________.

Sagot :

Answer: number 1 is zygote

1. Another name for a fertilized egg is a zygote.

2. The cell division process in which the fertilized eggs develop into a multicellular embryo (i.e., 2 cell, 4 cell, 8 cell, etc.) is mitosis.

3. The embryonic stage referred to as a hollow ball of cells is called the blastula and its central cavity is the blastocoel.

4. The embryonic stage where cells are moving inward toward the central cavity (invagination) forming the beginning of the primitive digestive system or archenteron (arch (G) = primitive; enteron (G) = gut) is called gastrula.

5. Stoma is (G) meaning mouth and deutero is (G) for 2nd. Therefore, deuterostomes are organisms in which the 2nd embryonic opening becomes the mouth of the organism and the 1st opening or blastopore becomes the anus.

6. The 2 major phyla that are deuterostomes: Echinodermata and Chordata.

7. Proto is (G) for first; therefore, in organisms that are protostomes the 1st opening becomes the mouth. Arthropods, 80% of animals, are protostomes.

8. Ectoderm develops into the skin and nervous system; mesoderm develops into organ system and endoderm develops into digestive and respiratory tube.

What is zygote?

  • The egg and sperm fuse to form a single cell called zygote.

What is mitosis?

  • It is a type of cell division which occurs in whole cell excepts in the s ex cells.
  • The parent cell divides into two equal daughter cell.

What is embryonic stage?

  • "After conception, your baby begins a period of dramatic change known as the embryonic stage."

What do you mean by blastula?

  • "It is a hollow sphere of cells produced during the development of an embryo by repeated cleavage of a fertilized egg."

What is blastocoel?

  • The fluid field cavity of blastula are called blastocoel.
  • It is surrounded by a layer of cells.

What is gastrula?

  • "An embryo at the stage following the blastula, when it is a hollow cup-shaped structure having three layers of cells."

What are deuterostomes?

  • Deutero means second and stoma means mouth.
  • This are the animals in which the first opening in cleavage develops into anus.

What are Echinodermata?

  • These are marines species that comes under deuterostomes.

What are Chordata?

  • "These animals have a large notochord like structure present in their embryonic development."

What are protostomes?

  • Proto means first and stoma means mount.
  • The animals in which the first opening in cleavage develops into mouth are called protostomes.

What is ectoderm?

  • "It is the outermost of the three germ layers which appears early in the development of an animal embryo."

What is mesoderm?

  • The cell layers present between ectoderm and endoderm is called mesoderm.
  • This layer gives rise to the development of organ system.

What is endoderm?

  • It is the innermost layer of germ cells.
  • It gives rise to tissues that form internal structures and organs.

Hence, the correct answers are: 1. zygote, 2. mitosis, 3. blastula; blastocoel, 4. gastrula, 5. mouth; anus, 6. Echinodermata; Chordata, 7. anus, 8.  skin and nervous system; organ system; digestive and respiratory tube.

To know more about embryonic stage here

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