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 Genetic disorders.  

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I need a little help please. I am a school teacher in the UK, currently teaching about mutations and genetic diseases. I know that diseases such as sickle cell anaemia and cystic fibrosis are caused by abnormal recessive alleles. I also understand the situation regarding transcription and translation from the genetic code.

My question is about the consequences of mutation.
I know that some substitutions will have no consequence because of the degenerate codons.
It is also pretty obvious that mutations that affect the primary sequence will normally be disadvantageous.
But is it true or false that these mutations will generally be recessive, like the two diseases mentioned?
Alternatively, is it the case that these mutations are generally dominant in nature, but result in an unviable fetus that will not reach birth?

Any help would be much appreciated.


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