What are the characteristics of archaebacteria? a)they are single cells that lack a nucleus and tend to live in moderate conditions. b)they are single cells that have a nucleus and tend to live in extreme conditions. c)they are single cells that have a nucleus and tend to live in moderate conditions. d)they are single cells that lack a nucleus and tend to live in extreme conditions.

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