If my father was left-handed and my son is left-handed, why then am I right-handed?

Answer 1

So handedness isn't a simple dominant-recessive trait. It's actually linked to lateralisation - a process during development where the two halves of the brain each become specialised for particular tasks. So all people who are right-handed are typically lateralised in the same way, for example they have an area of cortex on their left hemisphere dedicated to language (Broca's area) with parts of the right hemisphere dedicated to processing facial expressions (these are just two examples, there are many other left-right specialisations). But left-handers and a small minority of right handers have different speciaisations. So Broca's area may be found on the right hemisphere in these people. Other features of the typical left-right patten may or may not be swapped producing several different patterns of lateralisation within the human population, one dominant pattern, seen in about 90% of people and several other patterns seen in just a few percent of people.
Which pattern of lateralisation an individual is, (including whether they are left-handed or right-handed) is determined by their genes. Incidentally, a very small minority of people are naturally ambidextrous and don't actually have a genetically-determined hand preference. However, experience and development also play a role. So a genetically left-handed person who is made to use their right hand will, by virtue of practise become better at using their right-hand. Similarly, people can teach themselves to be "ambidextrous" by practising with their non-preferred hand, but this isn't the same as natural ambidextrousness.
So to (finally!) answer your question about why you aren't left-handed, lateralisation patterns (which determine handedness) are influenced by many different genes and different combinations of these genes will produce different patterns, so while left-handedness will "run in the family" it can't be predicted as easily or reliably as hair colour, or eye colour or any other single gene trait.

Answer 2

Most probably they carry a recessive allel of the right handed n the dominant of left hand, so its probably 25% that you would come out left handed

Answer 3

Who taught you to write right handed??? My great Grandfather was left handed ,my Dad is left handed,
I am left handed,my Son is left handed,my first
Grandson is left handed.My Dad taught me to write.
I taught my son to write left handed. Most of the time its who taught you to write.And Its wrong to force anyone to
write right or left handed. I was never forced,my son was never forced,my grandson was not forced.It is natural
to wait and see which hand you will write with.Don't worry
about why you are right or left handed.Just be happy
you can write.OKAY!!!

Answer 4

Left-handedness is learned in childhood. Since we live in a right-handed world, and most things are made with righties in mind, parents and educators often teach all children the same way of doing things... that is with their right hand.

Answer 5

Right-handedness is the dominant genetic trait in people. Left-handedness is recessive. Your dad and your son happen to have inherited a combination of chromosomes from their own parents such that the recessive gene had a chance to manifest.

Answer 6

Right handedness is dominant. Lefthandedness is recessive. It takes both genes for a trait(one from father one from mother) to show a recessive trait. It only takes one gene for a trait to show a dominant trait. So that shows that you were heterogeneous for that trait and could have passed on either trait. Your wife must either b left handed or heterogeneous for that trait also.

Answer 7

to be honest this is nothing to do with the genetic make up and the handedness is controlled by the dominant or non dominant temporal lobes in the brain

Answer 8

Its random.It's not really genetic as far as I know.But I'm guessing your mothers side of the family is right-handed

Answer 9

probably because when you were born you were forced to use your right hand just like the rest of us.

Answer 10

someone has to be the right hand man!