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214   NATURAL INHERITANCE.

TABLE 18.
EXAMPLE OF ONE CALCULATION IN EACH OF THE THREE CASES.

 
   

I.

   

II.

   

III,

 

Ancestry and their

eye-colours.

o

g b

0

ob

Contribute

to

 

0 ~

o~

ro

Contribute

to

8

g

4~

o ~a

~ro

c

Contribute

to

 

z

Light.

Dark.

z

Light.

Dark.

 

Light.

Dark.

Light-eyed parents,

Hazel-eyed parents.

Dark-eyed parents.

Light-eyed grand

parents   

Hazel-eyed grand

parents    

Dark-eyed grand

parents   

Residue, rateably as

signed   

Total contributions

2

...

...

..•

   ..

...

0.60

.•.

...

...

0'28

0.88

...

...

...

..,

...

0.12

0.12

...

1

2

1

...

0.16

0.20

...

0.25

0'61

.,.

...

0-12

0.16

0-11

0.39

1

I

1

2

1

0.16

...

0'08

0'10

...

0.12

0.46

0'09

0'25

...

0-06

0-08

0'06

0'54

 

1.00

 

1.00

 

1.00