- Humans have 46 chromosomes inside each of thier cells, all with many genes on them.
- The eggs that are made in the female's ovaries are also made by meiosis.
- A standard way of writing all this genetic information is by a genetic diagram.
- We can find out the genotype of an individual with the dominant phenotype for a particular fene by crossing it with one known to have the homozygous recessive genotype of the same gene. This is called a test cross.
- Pure-breeding strains are always homozygous for the pure-breeding characteristics.
- The offspring of two different pure-breeding (homozygous) strains are sometimes called the first filial generation, or F1 generation. They are always heterozygous.
- A woman's chromosomes are both alike and are called X chromosomes. She has the genotype **.
- A man only has one X chromosome. The other, smaller one is a Y…