The following links from Dr Bruno discuss the question of genetics
in transferring certain disabilities
and also whether caste and up bringing have any role to play in this.
There is also a talk on whether these are indicated in horoscope.
http://payanangal.blogspot.com/2008/06/blog-post_05.html
http://payanangal.blogspot.com/2008/05/blog-spot_7964.html
Dis-abilities are not passed on to everyone of the lineage.
Whether one inherits a particular disability or not
is decided by the karmic experience
that one has to undergo in a particular birth.
But the disability may be passed on to subsequent generations
so that at some time in future,
some future off-spring who is destined to undergo the effects of such a disability
inherits it.
According to sanathana dharma, such pass-on-s happen
to 14 generations before and 14 generations after.
Some defect that was there in the 14th generation before
may get manifest in one, if one is destined to suffer that.
The genetic pool offers a wide source and
the passing-on-s of some defects indicate that
it may get ‘activated’ at a future date in a future off-spring.
In the immediate context 3 generations influence the off-springs.
My write-ups on pithru tarpaN will give information on
what the soul takes along with itself after death.
In consonance with what the soul has to experience in a subsequent birth,
it enters a yoni and draws the genes accordingly.
There is absolutely no random selection as far as the soul is concerned.
The soul’s faculty of knowledge and brain power
are all possessed by it already
which were acquired by it in the previous births.
Depending on the karma,
the soul works on it and may have it shielded in that birth.
The famous PuranaanUru song by KaNiyan Poonkundran
(yaadum voorE, yaavarum kELir) describes this beautifully.
One can not judge a person by what he is in this birth.
He may have been an enlightened one
but born dull due to his karma.
Once he wears off that karma,
his subsequent birth will see him
shine with his enlightenment.
From Brahma sutras we know that even if one has attained
The equanimity required for Release (moksha),
if he has some karma that has to be experienced,
such a person will be born again only to wear off that karma.
After that he will attain Moksha.
In this context, background and caste have a limited role to play.
There have been cases of “kundhu mani in kuppai-medu”
(prized gem in abandoned site)
or “vatthiyaar pillai makku”
( a dull son born to a great teacher).
All these are to ward off karma.
In warding off karma,
the karma of all those with whom one is associated
also is taken into account.
It is wonderful matrix of placing many people in a set-up
and the interactive karma and experiences
working with each-other so that
everyone will undergo their share of karma –
not a needle-tip more or less.
That is why we don’t always find ‘inherited’ horoscopes
or inherited palms (in palmistry)
However I have seen inherited ‘attitudes’ in horoscopes and palms
in some cases,
which are what the individual souls possessed
or are destined to possess by acquiring from genes and / or
molded by back-ground.
I have also seen RH negative running in families,
indicated by defective Mars and Rahu too.
The RH negative / some defect
not coming into a particular off-spring among other siblings
has also been indicated by a defect – getting a bhangam,
which means the trait is of course hidden in that particular person,
but may be activated in a future off-spring.
Also watch out eclipse births and
births at amavasya.
There are bound to be inherited diseases.
As far as child-birth problems are concerned,
the defect may run into generations but will not get manifest at every one.
If, on the other hand it gets manifested in generation after generation,
we attribute it to some ‘curse’ and
seek to remove it by pariharas and correctives.
If the curse ceases to haunt the family,
those born after the parihara was done,
will not exhibit that curse in the horoscope.
Basically it is all about the karma that one has to undergo.