Re: Is it possible for a child of two straight-haired parents to have wavy hair

Sure, it is possible for you to have curly hair if your parents have straight 
hair.

The case of inheritance of curly hair illustrates incomplete dominance.  For 
example, when a curly - haired individual reproduces with a straight haired 
one, 
the children have wavy hair.  

There are many factors that can affect the curliness/straightness of a person's 
hair. These can include other modifying genes, diet, health, stress level, 
etc.  Therefore, even though your parents appear to have straight hair, they 
might actually genetically have wavy (slightly curly) hair.

It is possible that your two parents have wavy hair (Cc), not straight hair, 
and 
therefore could produce children with both straight (cc), wavy (Cc), or curly 
(CC) hair.

In addition, there is some debate among human geneticists about whether the 
trait 
of curly hair is controlled by only one gene.  In horses, for example, there 
are at 
least two "curly" genes, one of which is inherited dominantly and the other in 
a 
recessive fashion.  If you search google for "curly horse" you will find some 
excellent descriptions of the genetics of this trait.