Inbreeding harmful 1-2

There is universal taboo against father mother daughter son and sibling marriage. So in reading happens mostly within parallel or cross cousins and uncle nice marriage.

It increases the risk of homeo zygosity in a community so deleterious recessive genes are frequently expressed but since individuals are eliminated by natural selection only e suitable jeans survive. So, it is harmful if there are lethal genes but overtime they are eliminated.

In smaller populations genetic variations are small and increased chances of disorders like web toes and infertility. But if the population is large then it can sustain itself with inbreeding. The presence of so many communities like reddys of South India with cross cousin marriages is prove that inbreeding is not harmful and only in certain conditions it is harmful.

Add afzal study on bihar Muslims. Rao study in Tamil.

Andaman islanders fees because of very small population and a virgin to marry within small group. otherwise if large population is there and delete areas jeans eliminate individuals the populations survives