In a species of hamster, the allele S S\,S for short fur is dominant to the allele s s\,s for long fur. Two hamsters, each with genotype SsSsSs, produce 160 offspring. The observed results are shown in the table.
| Fur length | Observed number of offspring |
|---|---|
| Short | 119 |
| Long | 41 |
Calculate the expected number of offspring with long fur.
Compare the observed numbers with the expected numbers and explain why the observed numbers are not exactly as expected.
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.