Genetics
- Reproduction and meiosis
- Meiosis
- Four daughter cells
- Half the chromosomes
- Genetically different
- Gametes
- Haploid
- Fuse at fertilisation
- Human chromosome numbers
- Body cell: 46
- Gamete: 23
- Zygote: 46
- Meiosis
- DNA and the genome
- DNA polymer
- Nucleotides
- Double helix
- Two strands
- Nucleotide
- Sugar
- Phosphate group
- One of four bases
- Complementary base pairs
- A with T
- C with G
- Weak hydrogen bonds
- Genome
- Entire DNA of an organism
- Gene
- Section of DNA
- Codes for a protein
- Extracting DNA from fruit
- Mash
- Detergent and salt
- Filter
- Cold ethanol
- DNA polymer
- Inheritance
- Key terms
- Allele
- Dominant, recessive
- Homozygous, heterozygous
- Genotype, phenotype
- Monohybrid cross
- Punnett square
- Pedigree
- 3 : 1 ratio
- Sex determination
- XX female
- XY male
- 50% each
- Probability
- Ratios
- Fractions
- Percentages
- Carriers: 1 in 4
- Key terms
- Variation and genome
- Multiple genes
- Most features
- Genetic variation
- Mutation
- Sexual reproduction
- Environmental variation
- Acquired characteristics
- Mutations
- Most no effect
- Some small effect
- Rarely significant
- Human Genome Project
- Medical uses
- Testing
- Treatments
- Multiple genes