Question

(Comparative Embryology)

How is the peregrine falcon species similar to other species while as an embryo? Embryonic development NOT how the organism reproduces

-Include citations

Answer 1

Answer- Peregrine falcon species similar to other species in terms of embryonic development. As they undergo the same developmental stages as all other species which could be explained with the image given below

Above image represents the falcon embryological stages

Day 5

The embryo uses oxygen and disposes of CO2. Both have to be transported from and to the embryo. In the first 2-3 days, the early embryonic germ layers (ectoderm, mesoderm, and endoderm) in the blastoderm are just a few and so oxygen can be obtained easily. But as soon as the layers increase the embryo needs an infrastructure within the egg for the oxygen, nourishment and protection.

The 3 extraembryonic membranes are formed from the primitive germ layers within the egg. Everything needed for the development of the embryo is on board of the egg. Water, nourishment and energy like fat are there for tissue-growth and everything needed to maintain the process. The only things needed are warmth and oxygen.
On the 5th day of the embryonic development:

* The somites extend to the tip of the tail.

* The toes begin to form.

* The allantois is visible coming off the hindgut.

* The allantoid circulation is commencing

* The Erythropoiesis starts in the yolk sac

* The embryo starts to move with head and neck region

* The amnion starts to contract

* The proteinase is starting

Embryonic development day 15-18

Day 15:

* Claws begin to form.

* The cere is visible.

* Pterylae visible on the sternum

* Flight feathers appear.

* Feather tracts appear over the sternum.

* Lower eyelids develop.

* Embryo is moving

* Thyroid gland starts Thyroxine secretion

* Embryo moves to a position on the right of the egg

* Legs and torso grow faster than gead

* Embryo sinks because of that into the yolk
Day 16

* The toe claws begin to curve downward.

* The bottom of the feet become padded.

* Feather germs on the back and tail appear as long, tapering cones.

* The beak begins to harden.

* The comb appears serrated.

* The embryo begins to draw calcium from the eggshell for its growing
bones.

Day 17 & 18

* Scales appear on the lower legs.

* The embryo continues to grow and move.

* The ribs begin to ossify.

* Metanephros starts its function

* The Furcula is formed by the fusion of the 2 clavicles