In mice, black fur is dominant to white fur. A black mouse is crossed with a white mouse. Their offspring include both black mice and white mice.
Which statement explains these results?
The white parent has one allele for black fur.
Both parents have two alleles for black fur.
Both parents have two alleles for white fur.
The black parent has one allele for white fur.
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.