Dihybrid Cross

1. Dihybrid Cross Crossing two different traits Hair length and eye color

2. Hair Length • LL – Ll short hair (dominant trait) • ll long hair (recessive trait)

3. Eye Color • RR – Rrblack eyes (dominant) • rr red eyes (recessive)

4. The Parents • Both parents are heterozygous for both traits. • LlRr

5. FOIL the parents L L L l l l R R R r r r These are the different combinations of the two traits that the parents’ sex cells will contain.

6. LR Lr lR lr LR Lr lR lr

7. LR Lr lR lr L R LR L r l R l r Lr L R L r l R l r lR L R L r l R l r lr L R l r L r l R

8. LR Lr lR lr L R LR L r l R l r Lr L R L r l R l r lR L R L r l R l r lr L R l r L r l R

9. LR Lr lR lr LR LLRR LLRr LlRR LlRr Lr LLRr LLrr LlRr Llrr lR LlRR LlRr llRR llRr lr LlRr llrr Llrr llRr

10. What are the kids going to look like? • LLRR • LLRr • LlRR • LlRr • LLrr • Llrr • llRR • llRr • llrr Short hair, black eyes Short hair, red eyes Long hair, black eyes Long hair, red eyes

11. LR Lr lR lr LR LLRR LLRr LlRR LlRr Lr LLRr LLrr LlRr Llrr lR LlRR LlRr llRR llRr lr LlRr llrr Llrr llRr

12. What are the kids going to look like? • LLRR • LLRr • LlRR • LlRr • LLrr • Llrr • llRR • llRr • llrr Short hair, black eyes 9 Short hair, red eyes 3 Long hair, black eyes 3 Long hair, red eyes 1