Fruit flies can have normal wings or vestigial (very small) wings.
The allele for normal wings (N) is dominant. The allele for vestigial wings (n) is recessive.
The Table shows information about three fruit flies.
Table
| Fruit fly | Genotype | Homozygous or heterozygous | Phenotype |
|---|---|---|---|
| A | NN | homozygous | normal wings |
| B | Nn | normal wings | |
| C | nn | homozygous |
Complete the Table.
State what is meant by a recessive allele.
Explain the difference between the genotype and the phenotype of an organism.
Use fruit fly B as an example in your answer.
Give the allele or alleles that could be found in one gamete from fruit fly B.
186 exam-style questions on OCR GCSE Biology 5.1 Inheritance, covering 5.1.1 The genome, 5.1.2 Environment and phenotype, 5.1.3 Variants and mutations, 5.1.4 How genetic variants influence phenotype, 5.1.5 Asexual and sexual reproduction, 5.1.6 Haploid and diploid, 5.1.7 Meiotic cell division, 5.1.8 Single gene inheritance, 5.1.9 Predicting single gene crosses, 5.1.10 Sex determination, 5.1.11 Multiple gene inheritance, and 5.1.12 Development of our understanding of genetics. Each one has a worked solution and a mark scheme showing where the marks go.