Genetic Diagrams

• What do genetic diagrams show?

  The possible genotypes of offspring
• Humans are _____ organisms

  diploid organisms- have two sets of chromosomes

  
  

  • so we have two alleles for each gene
• Gametes are what?

  sex cells
• Gametes contain what 


  contain only one allele for each gene
• What happens when gametes from 2 parents fuse together

  The alleles they contain form the genotype of the offspring produced

  
  

  • at each locus, the genotype can be homozygous or heterozygous
• what can genetic diagrams be used to predict

  the genotypes & phenotypes of the offspring produced if 2 parents are crossed/bred.
• Monohybrid inheritance 


  the inheritance of a characteristic controlled by a single gene
• What do monohybrid crosses show

  the likelihood of the different alleles of that gene (and so different versions of the characteristic) being inherited by offspring of certain inheritance
• give an example of what the first set of offspring would be called (eg for fruit flies)

  the F1 generation
• codes for means ?


  contains instructions for
• punnett squares are used to ?

  predict the genotypes and phenotypes of offspring