An inherited condition in alpacas is controlled by one gene. The allele n n\,n is recessive and causes the condition. The allele N N\,N is dominant.
A breeder plans to mate a female alpaca with a male alpaca. The female does not have the condition, but her mother has the condition. The male has the condition.
Explain how this information can be used to find the probability that an offspring of these two alpacas will have the condition.
You may use a genetic diagram in your answer.
71 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.