1. Cell Division To be able to understand mitosis and meiosis
To be able to understand Inheritance

3. Meiosis

5. Boy or girl?

6. Inheritance
Alleles: alternative forms of a gene for a particular characteristic. Each allele is characterised by a slightly different nucleotide sequence.

9. Inheritance: genetic transmission of characteristics from parents to offspring
Genetics: study of inheritance
Phenotype: characteristics that result from the expression of an organism’s genotype. Phenotype depends on both the genotype and the environment.
Genotype: genetic instructions (contained in DNA) inherited from parents at a particular gene locus
Alleles: alternative forms of a gene for a particular characteristic. Each allele is characterised by a slightly different nucleotide sequence.
Dominant: refers to a trait (phenotype) that requires only one allele to be present for its expression in a heterozygote
Recessive: refers to a trait (phenotype) that will only be expressed in the absence of the allele for the dominant trait

10. Homozygous: having two identical alleles for a characteristic within the genotype
Heterozygous: having two different alleles for a characteristic
Complete dominance: type of inheritance in which the dominant trait requires only one allele to be present for its expression. It masks the allele for the recessive trait.
Codominance: type of inheritance in which the heterozygote shows the expression of both alleles in its phenotype
Incomplete dominance: type of inheritance in which the heterozygote shows the expression of the two alleles in its phenotype in a blending of the characteristics