Question

What is true about the order of human development?

1) Babies have all totipotent stem cells
2) It starts with a fertilized egg cell that is totipotent
3) It ends with an embryo being pluripotent
4) Egg → Fetus → Embryo → Baby

Answer 1

Human development starts with a totipotent zygote. These cells soon become pluripotent and eventually differentiate into multipotent cells as development progresses. The order of development is from zygote to embryo to fetus, and finally to baby.

Step-by-step explanation:

Understanding Human Development

The correct order of human development is as follows:

• The process starts with a fertilized egg known as the zygote, which is totipotent.
• This totipotent stem cell can give rise to all other types of cells in the human body.
• As the zygote divides, it gives rise to pluripotent embryonic cells, which can differentiate into various types of human tissue but cannot develop into a full organism.
• These pluripotent cells eventually become more specialized multipotent cells.
• The correct sequence is Egg (zygote) → Embryo → Fetus → Baby, not the one mentioned in the question.
• An embryo is made of pluripotent cells, which later differentiate into organ-specific tissues as they mature into a fetus.

In summary:

1. Human development begins with a totipotent zygote.
2. Initially, the inner mass of embryonic cells are totipotent.
3. The cells then transition to a pluripotent state and eventually into multipotent and more specialized cells.
4. The correct developmental order is Egg (zygote) → Embryo → Fetus → Baby.