Two Characters, Sex and X-linked Traits
Part 2 — the dihybrid cross, how sex is decided, and disorders carried on the X chromosome.
In this lesson you will
- Work out the F2 phenotypes of a dihybrid cross and obtain the 9 : 3 : 3 : 1 ratio
- Explain with a cross why the father’s gamete determines the sex of the child
- Work out crosses for haemophilia and colour blindness and explain why they are commoner in males