Chapter 18 - Inheritance

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  • Created by: E456
  • Created on: 24-03-17 12:24


  • 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…


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