it is present eukaryotic cell
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i)a gene portion of a dna that determines a certain trait.
ii)gene are responsible for the expression of traits.
i)an allele is a specific form of a gene.
ii)alleles are responsible for the variations in a given trait can be expressed.
a chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. the bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.