Cystic fibrosis is a recessive trait. Imagine that your friend Roger has cystic fibrosis but that his parents do not. What do you know about Rogers alleles and those of his parents at the cystic fibrosis locus of their DNA?

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    This information is insufficient to allow me to conclude anything about the cystic fibrosis alleles in Roger’s DNA.
    Roger is homozygous and his parents are heterozygous at the cystic fibrosis locus.
    This information is insufficient to allow me to conclude anything about the cystic fibrosis alleles in the DNA of Rogers parents.
    Roger is heterozygous and his parents are homozygous at the cystic fibrosis locus.

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asked May 30, 2013 in Biology by anonymous
    

1 Answer

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Roger is homozygous and his parents are heterozygous at the cystic fibrosis locus.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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