The HEXA gene codes for a protein that breaks down and recycles toxic substances in our brain and spinal cord. Mutations in the HEXA gene lead to Tay-Sachs disease. This is a disorder in which the level of toxic substances builds in the brain and spinal cord, leading to severe brain damage and eventually death. In many patients with Tay-Sachs, an insertion of four base pairs is seen in the HEXA gene. In general terms, explain how this insertion impacts the protein that is produced

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?