Where do the small molecules like water pass through the membrane?

The development of_ factored in the development of complex organisms.

How does the study of genetic disorders such as pku biologists understand normal alleles?

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.