A breeder repeatedly selects the largest tomatoes from closely related plants. Average fruit size rises, but a disease damages almost all plants in the new line.
.1
Explain how the breeder increased fruit size.
[2 marks]
.2
Suggest why the new line may be unusually vulnerable to one disease.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Two neurones meet at a synapse. An electrical impulse reaches the end of the first neurone.
.1
Describe how information passes to the second neurone.
[3 marks]
.2
A substance stops release of the chemical. Predict the effect on transmission at this synapse and explain your answer.
[1 mark]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
A campaign says: "Every lung cancer case is caused by smoking, so non-smokers need not consider any cancer risks."
Evaluate the campaign statement.
[6 marks]
6 marksHigher
Spec and skills
Original practice question
Answer and supported method checks
Two carriers of cystic fibrosis consider embryo screening. Screening can identify embryos with two recessive alleles, but the IVF process may not produce an unaffected embryo suitable for transfer.
Evaluate embryo screening for this couple.
[6 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A news report claims that a gene is a whole chromosome and the genome is the collection of proteins in a cell.
.1
Correct both claims using the relationships between DNA, genes, chromosomes and the genome.
