2.3 DNA and inheritance

Practice questions on DNA and inheritance

• A student says: 'DNA is just a long chain of nucleotides joined together.' Explain why thi… (4 marks, Explain)
• Explain how the base pairing rule ensures that the two strands of a DNA molecule are compl… (4 marks, Explain)
• Explain how a child can inherit a genetic disorder from two parents who do not show any sy… (4 marks, Explain)
• Explain why brothers and sisters from the same two parents can look different from each ot… (4 marks, Explain)
• A farmer has a herd of cattle. Some cattle have horns and some do not have horns. The alle… (4 marks, Explain)
• In pea plants, seed shape is controlled by a single gene. The allele for round seeds (R) i… (4 marks, Explain)
• In guinea pigs, coat colour is controlled by a single gene. The allele for black coat (B) … (4 marks, Explain)
• Explain why DNA is described as a polymer made up of monomers, and state what the monomers… (4 marks, Explain)
• Explain why scientists describe DNA as a 'double helix'. (4 marks, Explain)
• Describe the structure of a DNA molecule. (4 marks, Describe)