What is an index fossil?
o
a. a fossil found in rocks from one time period
b. a fossil that has vestigial structures
o
c. a fossil that contains rocks and minerals
d. a fossil that formed 300 million years ago
submit

Select the correct answer. tay-sachs disease is caused by a mutation in the hexa gene located on chromosome 15. tay-sachs follows an autosomal recessive pattern of inheritance. with the of the diagram, identify which of the offspring will be an unaffected carrier. a diagram showing the genes of parents who are carriers of tay-sachs disease a. a, b, and c b. b and c c. a and d d. a e. d