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What does heterozygous mean?

What pair of chromosomes determine the gender?

What is a recessive allele?

What is a dominant allele?

Is Cystic Fibrosis caused by a dominant or recessive allele?

What are the symptoms of cystic fibrosis?

What happens if someone only has one of the alleles which cause cystic fibrosis?

Is Huntington's disorder caused by a dominant or recessive allele?

What are the symptoms of huntington's?

How long does it take before the symptoms begin to appear?