Answer quickly. thinking about how gene expression affects cellular differentiation, explain why a rabbit looks so much different as an adult compared to a single fertilized egg.

Gene expression can be defined as a group of processes that occur in living cells involved in forming a gene product (proteins or different RNA) from the gene. Gene expression includes steps such as transcription, RNA splicing, translation, and post-translational modification of a protein. It is the basis for cell differentiation: since all cells contain the same genetic information, the expression of different genes leads to different structural and functional cells. In other words, the combination of genes that are turned on and off dictates cellular morphology) and function.

Fertilized single cell quickly divides and new daughter cells began to differentiate (become different from each other) thanks to different gene expression. That’s why the adult cells are way different than the fertilized egg cells.

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.