3. seasonal changes on earth are primarily caused by
the
a) parallelism of the sun's axis as the sun revolves
around earth
b) changes in distance between earth and the sun
c) elliptical shape of earth's orbit around the sun
d) tilt of earth's axis as earth revolves around the
sun

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