What this practice covers
These questions are drawn from past CIE 0654 Co-ordinated Sciences papers and filtered to inheritance. You answer, you find out immediately whether you were right, and you get the reasoning for the correct option and for each distractor. Wrong answers go to a mistakes locker so you can come back to exactly those.
Practice is free. You need an account only so your progress and your mistakes are still there next time.
Start practising practice questions →
What examiners see students get wrong here
These are the errors that cost marks on inheritance, taken from our own topic notes. Read them before you practise and you will recognise the traps in the questions.
- Saying a gene codes for a characteristic or for fats, rather than for a protein.
- Saying an allele is a different gene.
- Confusing genotype with phenotype.
- Saying gametes are diploid, or that a zygote is haploid.
- Saying meiosis makes two cells, or that mitosis makes four.
- Saying meiosis is used for growth and repair.
- Reading a 3 : 1 ratio as 3 : 1 genotypes. The genotypes are 1 : 2 : 1; the phenotypes are 3 : 1.
- Giving an organism with the recessive phenotype a heterozygous genotype.
Revise it first
If any of the above is unfamiliar, work through the notes before practising: Inheritance revision notes.