As inter-caste marriages are objected by Hindus, the same tradition followed by people marrying in same Gotras. However, this belief no longer holds important in this modern world. The main reason behind this is the close connection of DNA between the guy and the girl if they belong to the same clan.
Do you know about the Hindu Gotra system?
Gotra is a system which associates a person with his ancient ancestor in an unbroken lineage. Gotras believed to be descendants of Saptarishis. According to Brahmins, they believe themselves to be successors of 8 Saptarishis namely, Angirasa, Atri, Gautam, Kashyapa, Bhrigu, Vasistha, Kutsa, and Bharadwaja.
Do you know Gotra ultimately pass from father to his son and not to daughter?
The Gotra of son remains same throughout the life, whereas that of a daughter gets changed after marriage. She inherits Gotra of his husband. This is the only reason, why every family needs a son.
A per the system, people with same Gotras who marry are considered as siblings. This was originally defined in the 4th century BCE and is still continued over time in most Hindus.
According to science, humans have 23 pairs of chromosomes. Out of each pair, one from the father and another one is the mother. All total, we have 46 pairs of chromosomes, 23 from the father and another 23 from the mother. There is sex chromosome that decides the gender of the person.
If the result is XX, it’s a girl and XY means it’s a boy. X chromosomes decide female attributes of a person and Y decides male attributes. However, men only have a Y chromosome that ultimately passes from son to grandson and the process continues. The X chromosome is preserved only for a girl.