Module 3 of 6 · Text
Dihybrid inheritance
- Dihybrid cross is used to show the inheritance of two different genes which may be located on different pairs of homologous chromosomes but control one phenotype --> each gene could have two or more alleles
- Homozygous parents produce all heterozygous offspring
- Heterozygous parents produce 9:3:3:1 offspring (usually)
- Expected ratio different to actual because of random fertilisation and crossing over doesn't always occur