CAIE IGCSE Biology EXTENDED 17.4.13 To use a test cross to identify
CAIE IGCSE Biology EXTENDED 17.4.13 To use a test cross to identify
Practise choosing and interpreting test crosses to decide whether a dominant phenotype has a homozygous or heterozygous genotype.
How this is tested
- choose a homozygous recessive partner to test an unknown dominant genotype
- interpret offspring phenotypes to distinguish homozygous dominant from heterozygous parents
- explain test-cross outcomes using examples