Molecular/structural orientations (gradients) in an egg are thought to play a significant role in development. What is the origin of such gradients?
A) During early development, the nucleus is placed into position of the highest concentration.
B) The side facing up has the lowest concentration of molecules.
C) When an egg is fertilized, the gradient is set up based on the side of the egg on which the most mitochondria reside.
D) During formation of the egg, nutritional as well as informational molecules (RNAs) are placed in appropriate positions for the development of the embryo.
E) Where the sperm penetrated the egg is the area of highest concentration.
Answer: D
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