Pass Check: Genetics, Reproduction & Evolution
DNA, inheritance, genetic diagrams, variation, natural selection and evolution.
Allele
A different version of the same gene.
Genotype
The genetic makeup of an organism in terms of the alleles it carries.
Natural selection
The process by which organisms with characteristics best suited to their environment are more likely to survive and reproduce, passing on their alleles.
Mutation
A random change in the DNA base sequence of a gene, which may or may not affect the organism's characteristics.
Quick check
Mixed quiz
1. How many chromosomes are in a normal human body cell?
2. State how fossils provide evidence for evolution.
3. A moth population has 90% dark moths and 10% pale moths before pollution decreases. After pollution reduces, dark moths become easier for predators to see. Calculate the likely change in the pale moth percentage after several generations.
4. Explain one advantage and one disadvantage of selective breeding compared with natural selection for improving livestock.
5. State the number of chromosomes in a normal human body cell.
6. What is DNA?
7. Explain why antibiotic resistance in bacteria has increased.
8. State what a mutation is.