Duchenne muscular dystrophy (DMD) is an especially severe ge…

Duchenne muscular dystrophy (DMD) is an especially severe genetic disorder caused by mutations in the gene encoding dystrophin. Beginning in 2018, several pilot studies were initiated to see if genetic engineers could correct mutations in the dystrophin gene using the CRISPR-Cas9 system. In these trial experiments, a modified adenovirus was used to deliver the CRISPR-Cas9 system into a muscle cell, which would then modify the dystrophin gene. While successful, more work remains to be done to ensure that such treatments can be used to safely in actual patients. Genetic technology used to treat a disease in an individual is known as ________.

Red-green color blindness in humans is inherited as a recess…

Red-green color blindness in humans is inherited as a recessive X-linked trait. The allele for normal vision is B, and the allele for colorblindness is b.  A husband and wife have 4 sons and 2 daughters. All 4 sons are color-blind, but none of the daughters are color-blind. What are the most likely genotypes of the parents?