A single gene disorder is one that's known to be caused by a single gene. Multiple gene disorders, however, can be caused by multiple gene combinations and other factors. Dominant genes are always expressed in the offspring, while recessive genes are only expressed if the offspring recieves the recessive gene from both parents. Sex-linked genetic disorders occur most often in men, and are caused by a single-gene disorder gene being on the X chromosome but not the Y, so that the offspring needs only one recessive gene to have the trait/disorder.
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The ventral visual stream projects to the inferior temporal cortex and is involved in the perception of form. While the dorsal visual stream projects to the parietal association cortex and is involved in the analysis of spatial location. the ventral visual stream is a pathway that stretches from the primary visual cortex in the occipital lobe forward into the parietal lobe.
