Monday, December 13, 2010

Inheritance of Traits: where do you get what from?

Every trait you have is from your parents chromosomes, and now in yours! This is where their DNA is inside of you in each of your cells. Each trait is determined by a sequence of DNA which makes up your genes or genetics. This is a list of different diseases and traits and how they're inherited from your parents, so you can get an idea of whether you might inherit something or not from your parents.

There are five main ways of inheriting traits from your parents chromosomes. There's Autosomal Dominant inheritance, Autosomal Recessive inheritance, X-Dominant, X-Recessive, and Y-linked inheritance. Following is a brief explanation of what those types mean and who they affect.

                                                 (Legend for reading pedigree charts)

 Autosomal Dominant traits:


-Females and males are equally likely to have the trait.
-Traits do not skip generations (generally).
-Affected children have at least one affected parent.
There is male-to-male transmission.
and Autosomal Dominant trait's pedigree would look something like this





Autosomal Recessive:


-Males and females are equally likely to have the traits.
-Traits often skip generations.
-Affected children are born to unaffected parents (carriers).
 
Pedigree of Autosomal Recessive trait 



X-Linked Dominant Traits:

-Twice as many females as males are affected.
-Traits doesn’t skip generations.
-Generally an affected female will pass the trait to half her children, and sons and daughters will be equally affected.
-All daughters of an affected male will be affected.
-There is no male-to-male transmission.


Pedigree for X-Linked Dominant traits





X-Linked Recessive Traits:



-The trait is far more common in males than in females.
-The trait skips one or more generations.
-Affected males are usually born to unaffected mothers.
-There is no male-to-male transmission

example pedigree of X-Linked Recessive trait



Y-Linked traits:

-Only males are affected. 
-All sons of an affected male will be affected.


-The trait does not skip generations

Example of Y-Linked trait pedigree 








So those are how your traits are inherited from your parents, and a brief overlook of how the sequencing through generations happens for the different modes of inheritance.

1 comment:

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