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Dihybrid Cross

This guide explores a dihybrid cross involving two different traits: hair length and eye color. In this genetic scenario, hair length exhibits two alleles—short hair (dominant, LL or Ll) and long hair (recessive, ll), while eye color has black eyes (dominant, RR or Rr) and red eyes (recessive, rr). Both parents are heterozygous for these traits (LlRr), leading to various combinations in offspring. By applying the FOIL method, we determine the potential phenotypes of children, including short hair with black or red eyes and long hair with either eye color.

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Dihybrid Cross

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  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

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