Dihybrid Cross

Inheriting two traits

x	YR	Yr	yR	yr
YR	YYRR	YYRr	YyRR	YyRr
Yr	YYRr	YYrr	YyRr	Yyrr
yR	YyRR	YyRr	yyRR	yyRr
yr	YyRr	Yyrr	yyRr	yyrr
9:3:3:1
Law of independent assortment

How to cross punnett square

FOIL
- First
- Outside
- Inside
- Last
Set up genotype for both parents
Cross it and show all combinations
Wolves problem
- Legend
  - B - Brown eyes
  - b - Blue eyes
  - G - Grey coat
  - g - Black coat
- P Gen
  - Blue eye grey (black mother) - bbGg
  - Other wolf - BbGg
- Cross
  - bbGg * BbGg
    | x | bG | bg | bG | bg |
    | --- | ---- | ---- | ---- | ---- |
    | BG | BbGG | BbGg | BbGG | BbGg |
    | Bg | BbGg | Bbgg | BbGg | Bbgg |
    | bG | bbGG | bbGg | bbGG | bbGg |
    | bg | bbGg | bbgg | bbGg | bbgg |
    Phenotypic Ratio
BG
- 6
Bg
- 2
bG
- 6
bg
- 2
Rabbit Problem
- Legend
  - H - grey hair
  - h - white hair
  - E - black eyes
  - e - red eyes
- P Gen
  - Father
    - HHee
  - Mother
    - hhEe
- Cross
  - HHee * hhEe

x	He	He	He	He
hE	HhEe	HhEe	HhEe	HhEe
he	Hhee	Hhee	Hhee	Hhee
hE	HhEe	HhEe	HhEe	HhEe
he	Hhee	Hhee	Hhee	Hhee
Phenotypic Ratio

HE
- 8
He
- 8