Copyright information: information content copyright owned by Cat World expires 70 years from September 1974 at which time the information minus the research notes may be placed in the public domain.
Research note: Colour used to show changes when colors discussed. Also the use of color -- how else could this be enhanced? Any ideas about infolinks? Links to glossaries -- are these the best way to do online presentation of glossaries? Would this be better as a soundbyte that you hear when you click on it? Or what about a video in some cases? Here we have also indented the text to make sure its not too close to the edge of the screen for reading. Can we manage this with style sheets?  Articles enhanced with pictures to visually show the effect of the pairs of genes involved.  Comments so far from reviewers indicate that this is a better way to present information because it helps them understand better.  Using cats for people who are involved with cats also makes it easier to understand and hopefully apply the concepts presented.

College of Cat Genetics: Part VIII
by Patricia Turner

Study Unit 8

The 9:3:3:1 Ratio Punnett Square
Punnetts Square showing the ratio of kittens from a mating between two F1 heterozygotes Dd+r.
Dd+rDd+r
D+
Dr
d+
dr
D+
DD++
Black SH
DD+r 
Black SH
Dd++
Black SH
Dd+r 
Black SH
Dr
DD+r 
Black SH
DDrr 
Black Rex
Dd+r
Black SH
Ddrr 
Black Rex
d+
Dd+r 
Black SH
Dd+r 
Black SH
dd++ 
Blue SH
dd+r 
Blue SH
dr
Dd+r 
Black SH
Ddrr 
Black Rex
dd+r 
Blue SH
ddrr 
Blue Rex

Ratio:  9 Black SH:3 Black Rex:3 Blue SH:1 Blue Rex