Q13 of 52 Page 9

Where are the genes located? What is the chemical nature of genes?

Genes are segments of the DNA, which is wound compactly into chromosomes. A gene is composed of a specific sequence of nucleotides. A nucleotide is made up of a nitrogenous base, a sugar molecule and a phosphate group.

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11 Explain Darwin's theory of evolution. 12 Define Genetics. What is the contribution of Mendel in the field of genetics? 14 During which stage can the chromosomes be seen clearly? Write the features of the eukaryotic and prokaryotic chromosomes. 15 Who provided the evidence of DNA as the genetic material? Write the names of the components of the DNA molecule.