Final answer:
Head shape, facial contour, hairline, and hair texture are genetically controlled visible characteristics.
Step-by-step explanation:
Head Shape
The shape of the head refers to the overall structure and contours of the skull. It can vary among individuals and can have genetic influences. For example, some people may have a round head shape, while others may have a more square or triangular shape.
Facial Contour
Facial contour refers to the shape and structure of the face. It includes features such as the placement and prominence of the cheekbones, jawline, and chin. Genetic factors can contribute to the overall facial contour of an individual.
Hairline and Hair Texture
The hairline refers to the line where the forehead and scalp meet, and it can vary among individuals. Similarly, hair texture is determined by genetic factors and can range from curly to straight, thick to thin, and coarse to fine.