Understanding Genetics

What is the shape of DNA?

• Quadruple helix

• Triple helix

• Double helix

• Single helix

Which of the following is NOT a nitrogen base found in DNA?

• Uracil

• Cytosine

• Thymine

• Adenine

What are segments of DNA that determine characteristics called?

• Chromosomes

• Genes

• Nucleotides

• Alleles

How many chromosomes do humans have?

• 78

• 48

• 46

• 23

What are alternate forms of a gene called?

• Chromosomes

• Nucleotides

• Alleles

• Bases