Final answer:
A young child with a markedly deficient anterior pituitary secretion would likely suffer from pituitary dwarfism disorder due to low levels of GH, leading to significant growth reta-rdation while generally maintaining normal mental and sexual development.
Step-by-step explanation:
If an anterior pituitary secretion is markedly deficient in a young child, the child would likely develop pituitary dwarfism disorder. This is a condition caused by abnormally low levels of Growth Hormone (GH), which results in growth reta-rdation, leading to a reduced growth rate, and in some cases, the child might be under 30 inches in height. Despite the short stature associated with this disorder, affected individuals usually have normal mental and sexual development.
A balanced production of GH is critical for proper development during childhood. The hyposecretion of GH in children can have significant impacts on their growth, while in adults it generally does not cause abnormalities. Excessive secretion of GH, on the other hand, can lead to gigantism in children and acromegaly in adults.