Refer to the figure showing a scanning electron micrograph of a chick embryo. 
In this image the overlying epidermal ectoderm has been removed, and we are looking down on the embryo from above.The tissue labeled "a" will soon form a(n) _______, which lies posterior to the structures labeled "b."
Definitions:
Gamete
Ovum or spermatozoon.
Chromosomes
Structures found within cells that contain DNA and proteins, responsible for carrying genetic information.
X-linked Color-blindness
A genetic condition affecting the ability to see colors correctly, passed down through genes located on the X chromosome.
Colorblind
A condition where a person is unable to distinguish certain colors, typically due to the absence or malfunction of certain color-detecting cells in the eye.
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