A part of series on English grammar...
DUAL GENDER
Dual Gender refers to a category of nouns in which there is no indication of gender. The nouns referred to include a range of words used for people, and occasionally animals, which can be of either gender.
Unless the gender is specified, we do not know the sex of the person referred to. Such words include ‘artist’, ‘author’, ‘poet’, ‘singer’, ‘child’, ‘pupil’, ‘student’, ‘baby’, ‘parent’, ‘teacher’, ‘dog’.