Angelique has a chromosomal disorder characterized by a missing x chromosome making her xo instead of xx. angelique's doctors have diagnosed her with

Angelique has a missing X chromosome, and thus, the doctor have diagnosed her with Turner's syndrome. The Turner's syndrome is a medical condition that arises when an X chromosome is completely or partially missing. Multiple developmental and medical problems arises because of this missing chromosome. The turner's syndrome only affect the females of a population.

Hence, the blank can be filled with 'Turner's syndrome'.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.