If the Aryan invasion theory is false, then why are the Indian people in the Northern parts fairer than that of the southern parts?

The observation that people in Northern parts of India tend to have fairer skin compared to those in Southern parts is often attributed to various factors, including historical migrations, genetic diversity, and environmental influences. It's important to note that skin colour is a complex trait influenced by multiple genetic and environmental factors, and it doesn't solely determine one's ancestry or ethnic identity.

Here are some factors that may contribute to differences in skin colour within India:

Genetic Diversity: India has a highly diverse population with a complex history of migrations, interactions, and intermixing among different ethnic groups. Genetic studies have shown that populations in different regions of India have varying genetic ancestries, which can contribute to differences in physical traits, including skin colour.

Historical Migrations and Settlements: Throughout history, various populations migrated to and settled in different parts of the Indian subcontinent. These migrations, along with interactions and intermarriages between different groups, have contributed to genetic diversity and variations in physical characteristics, including skin colour.

Environmental Factors: Environmental factors such as latitude, altitude, and exposure to sunlight can also influence skin colour. Regions closer to the equator typically receive more intense sunlight, which can lead to darker skin pigmentation as a protective adaptation against harmful ultraviolet (UV) radiation. In contrast, regions farther from the equator may experience less intense sunlight, leading to lighter skin pigmentation.

Cultural Preferences and Practices: Sociocultural factors, including historical beauty standards and cultural practices, can also play a role in perceptions of skin colour. In some cultures, fair skin has been historically associated with beauty, status, and privilege, leading to preferences for lighter skin tones.

It's essential to approach discussions about skin colour and physical traits with sensitivity and awareness of the complex interplay of genetic, environmental, and cultural factors. While differences in skin colour exist within India, they do not necessarily support the validity of the Aryan invasion theory, as skin colour variation is a multifaceted phenomenon influenced by numerous factors over millennia.