Factors responsible for imbalances in the sex ratio found in different parts of the world and occupational structure:

Geographical Factors
1. Cultural Preferences: Some cultures have a preference for male children due to societal beliefs, inheritance laws or religious practices. This preference leads to female foeticide or infanticide, resulting in an imbalanced sex ratio.
2. Migration: In areas with high male-dominated industries, such as mining or construction, migration of men can lead to a temporary imbalance in the sex ratio.
3. War and Conflict: War and conflict can cause a significant loss of male lives, leading to an imbalanced sex ratio.

Medical Factors
1. Prenatal Diagnostic Techniques: The availability of prenatal diagnostic techniques has made it easier for parents to abort female fetuses, leading to an imbalanced sex ratio.
2. Infertility Treatments: The use of assisted reproductive technologies, such as in-vitro fertilization, can lead to a higher proportion of male births due to the selection of male embryos.
3. Gender-Based Sex Selection: In some cases, parents may opt for gender-based sex selection for non-medical reasons, resulting in an imbalanced sex ratio.

Occupational Structure
1. Gender-Based Occupational Segregation: Certain industries and occupations have historically been dominated by either men or women, leading to imbalances in the sex ratio within those industries.
2. Discrimination and Bias: Discrimination and bias against women in the workplace can lead to fewer opportunities for women to enter male-dominated industries, resulting in an imbalanced sex ratio.
3. Work-Life Balance: Women may choose to work in industries that offer more flexibility and work-life balance, leading to imbalances in the sex ratio within certain industries.

In conclusion, various factors such as cultural preferences, migration, war and conflict, prenatal diagnostic techniques, infertility treatments, gender-based sex selection, gender-based occupational segregation, discrimination and bias, and work-life balance contribute to imbalances in the sex ratio found in different parts of the world and occupational structure.