Which is easier to identify karyotype changes in number or in chromosomes structure

How does the study of genetic disorders such as pku biologists understand normal alleles?

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Types of scientific inquiry that biologist engage in that cannot be completely controlled