- Cystic fibrosis is a recessive disorder. Neither Oliver or Karla have cystic fibrosis, but their son James does.
Who among Oliver, Karla, and James is heterozygous for the cystic fibrosis allele? Who is homozygous? - After completing your biology class, you feel like you have a better understanding of genetics. Then you see
an article posted on social media talking about Huntington disease, a progressive neurological disorder. It links
to a website that says that based on many years of research scientist and doctors saw that Huntington disease
is a genetic disease that is inherited in a dominant pattern, meaning if a parent has the disease the child has a
50:50 chance of inheriting it. But the author of this website found a family where all 8 children have Huntington
disease. This, the author says, shows that science is all wrong about Huntington disease because if there is
really a 50:50 chance of inheriting the disease, then only 4 of the children would have it. Is this article correct or
not? Explain your answer - In a shocking discovery, biologists discover dragons! Dragon geneticists determine that flame eyes (F) are
dominant to blue eyes (f) and burbling (B) is dominant to whistling (b). They suspect that the two genes are
linked in one of the autosomes. They mate a true-breeding, flame-eyed, burbling female with a true-breeding,
blue-eyed, whistling male. They then mate a pair of the offspring. Assuming dragon genetics follows the same
rules as fruit flies, what ratio of genotypes would you expect if the genes were not linked? (Remember you are
crossing FfBb x FfBb). If the genes are linked, which of the following F2 genotypes will be rarer than would be
expected if the genes were not linked? - Analyze the pedigree below and determine if the trait is inherited as autosomal dominant, autosomal
recessive, X-linked dominant, X-linked recessive, or Y-linked. Justify your answer
Sample Solution