When a river flows over time, it may leave a deep groove with tall sides called a(n)? Possible answers in photo.

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

Restriction enzymes are used in making recombinant dna. describe the role restriction enzymes perform when constructing recombinant dna.

Connection compare and contrast genetic engineering to the process of natural selection. select all statements that are true.