List the key differences between meiosis l and ll

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.

The relationship between intron and exon

This connective tissue consists of large round densely packed cells with the nucleus pushed to one side.