The DNA of a fruit fly is found in 8 chromosomes in each body cell.
Put these structures in order of size, starting with the smallest.
chromosome gene nucleotide nucleus
A gene in fruit flies controls eye colour.
Explain how a gene can control a characteristic such as eye colour.
The 8 chromosomes in one body cell of a fruit fly contain 280 000 000 base pairs in total.
Calculate the mean number of base pairs in one chromosome.
Give your answer in standard form.
44 exam-style questions on Edexcel GCSE Biology 3.2 DNA and protein synthesis, covering 3.2.1 DNA structure as a polymer, 3.2.2 Genome and gene definitions, 3.2.3 Extracting DNA from fruit, 3.2.4 Base order determines protein shape, 3.2.5 Stages of protein synthesis, 3.2.6 Non-coding DNA variants affecting phenotype, and 3.2.7 Coding DNA variants affecting phenotype. Each one has a worked solution and a mark scheme showing where the marks go.