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📘 How does an egg develop into a chick?

Hold a fertilized egg up to a light and remember that its story began before it reached your hand. The small pale spot on the yolk is the blastodisc, where the embryo begins. Before incubation, most of the egg is still storage and protectio

5
lessons
~25 min
to learn
Adults
level
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What you’ll learn

  1. An egg is a self-contained starting placeIdentify how the yolk, albumen, shell, and blastodisc support development.A fertilized egg packages a starting cell region with food, water, protection, and a porous shell.
  2. The shell supports gas exchangeExplain how pores, membranes, the air cell, and allantois support respiration.Oxygen enters and carbon dioxide leaves through shell-based exchange surfaces while temporary membranes manage waste and breathing.
  3. The first days build the body planTrace cell division, gastrulation, folding, and early circulation.During the first three days, a cell sheet becomes an organized embryo with a body axis, neural tube, heart, and blood vessels.
  4. Organs and body parts growDescribe how organs, limbs, and temporary membranes develop during the first week.The embryo grows recognizable organs and body parts while the yolk sac, amnion, chorion, and allantois supply and protect it.
  5. The final week prepares a hatching chickSequence late development from yolk absorption through internal pipping and hatching.The chick fills the egg, changes posture, reaches the air cell, cracks the shell, and transitions to breathing outside air around day 21.

Questions this course answers

Which part supplies most of the embryo's stored energy?

The yolk stores concentrated fats, proteins, vitamins, and minerals that the yolk sac transfers to the embryo.

Match each egg part to its main job.

The egg divides storage, protection, exchange, and embryonic starting functions among different parts.

How does oxygen reach the embryo?

Oxygen diffuses across the porous shell and membranes to nearby blood vessels.

Why are the allantois and air cell important?

Both are temporary parts that help the embryo shift from membrane-based exchange to breathing atmospheric air.

Put these early developmental events in a useful order.

Early division is followed by organization, folding, and the first working transport system.

What does gastrulation mainly accomplish?

Gastrulation moves cells into layers that contribute to different tissues and establishes the body plan.

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