Two siblings inherit different alleles of the same gene from a parent.
Which statement correctly describes these alleles?
They are different genes at separate positions on the same chromosome.
They are different versions of a gene at the same chromosome position.
They are identical versions of a gene on different sex chromosomes.
They are identical genes found only in different types of gamete.
43 exam-style questions on Edexcel GCSE Biology 3.3 Inheritance, covering 3.3.1 Gregor Mendel and the basis of genetics, 3.3.2 Alleles and inherited characteristics, 3.3.3 Monohybrid inheritance, 3.3.4 Determination of sex at fertilisation, 3.3.5 Outcomes from monohybrid crosses, 3.3.6 Inheritance of ABO blood groups, 3.3.7 Inheritance of sex-linked disorders, and 3.3.8 Multiple genes and phenotypic features. Each one has a worked solution and a mark scheme showing where the marks go.