A breeder recorded the coat colours produced in two hamster crosses.
| Cross | Parents | Offspring |
|---|---|---|
| A | Pure-breeding silver-coated × pure-breeding cream-coated | 48 silver-coated, 0 cream-coated |
| B | Two silver-coated offspring from cross A | 74 silver-coated, 26 cream-coated |
Which statement about the gametes made by the two silver-coated parents in cross B explains the cream-coated offspring?
Each parent made some gametes carrying a silver allele and some carrying a cream allele.
Each parent made gametes that each carried both a silver allele and a cream allele.
Each parent made gametes carrying only the silver allele, because silver is dominant.
One parent made only silver-allele gametes and the other made only cream-allele gametes.
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.