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A-Level Biology OCR A

State Gametes Drawing Genetic Phenotype Parents Genotype Square

Describe the 6 steps for drawing a genetic diagram, starting with the parents' phenotypes and culminating in determining the proportions of offspring genotypes and phenotypes.

Describe los 6 pasos para dibujar un diagrama genético, comenzando por los fenotipos de los padres hasta determinar las proporciones de los genotipos y fenotipos de la descendencia.

Front Describe 6 steps for drawing a genetic diagram.
Back Drawing genetic diagram:
  • State phenotype of both parents
  • State genotype of both parents (assign letter to represent alleles of gene being studies where capital is the dominant, lower case is the recessive allele)
  • State gametes of each parent 
  • Draw Punnett square to show results of random fusion of gametes during fertilisation, labelling gametes on edges of square
  • State proportion of each genotype produced among offspring 
  • State corresponding phenotype for each of possible genotypes

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