Tay sachs disease is caused by a frameshift mutation on chromosome 15. a person with tay-sachs lacks the enzyme hexosaminidase a. this enzyme is needed to break down gangliosides, a fatty substance that is formed in nerve cells and in the brain. why does the frameshift mutation result in this disease.

How does natural selection change thephenotypes within a population over time?

Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. now imagine that you traveled to an earth-like planet located light-years away that is known to support life. think about what you’ve learned in this unit and make an argument for what you think would be the dominant type of life form on this planet. consider whether a notochord is required for an organism to manipulate its environment and become a dominant creature.

How are fossils used to date organisms?