What is a "genetic map"? ✔️✔️a map of the relative positions of genes (or any genetic loci) on
a chromosome
Why was the family that Dr. Nancy Wexler studied so useful? ✔️✔️members of the family
were willing to donate DNA samples
it was a very large family in which many individuals had Huntington's Disease
On which chromosome did Dr. Wexler's team find a genetic marker that was linked Huntington's
Disease? ✔️✔️chromosome 4
What is different between disease and normal alleles of the Huntington's disease gene (IT15)?
✔️✔️the HD alleles have more CAG codons than normal alleles
How do bacteria use CRISPR/Cas9? ✔️✔️Bacteria store bits of viral DNA sequences in the
CRISPR site of their genome
Bacteria use CRISPR/Cas9 machinery to find, cut out, and degrade viral DNA later on, similar
to immunization in humans