Which term describes having two identical alleles for a gene?
From Paper 4, Higher
43 marks
Give three reasons why the theory of natural selection was only gradually accepted.
From Paper 4, Higher
113 marks
Explain how meiosis produces genetic variation.
From Paper 4, Higher
154 marks
Polydactyly is caused by a dominant allele (D). A heterozygous parent and a parent without the condition have a child. Calculate the probability that the child has polydactyly, showing a Punnett square.
From Paper 4, Higher
183 marks
Describe the work of Mendel and why it was not recognised at first.
From Paper 4, Higher
233 marks
Explain the terms gene, allele and genotype.
From Paper 4, Higher
244 marks
Explain how natural selection could lead to the evolution of camouflaged moths.
From Paper 4, Higher
253 marks
Explain why the three-domain system replaced the five-kingdom system.
Score 0 / 24 · 0 of 8 marked
This paper is written by Plasmo in the style of the OCR GCSE Biology exam. It is not a past paper and is not produced or endorsed by the exam board.