A lesson on probabilites with double recessives

[paulh]

I don't own this book, per say, but it looks like a great reference for genetics that's geared towards herps! It's got explanations and pictures that are designed for reptile breeders. I've heard good things and will probably invest in this book in the near future.

http://geneticsforherpers.com/

I do own the book. It is worth getting.

Second, I have been trying to figure out the probabilities of a double hey breeding and what the hets will be percentage wise. So its a double het caramel/pied to double het caramel pied.

I ad to memorize this in my univ genetics course.

Both pied and caramel are recessive to the respective normal gene. The results would be different if one or both mutant genes is dominant or codominant to the alternative normal gene.

+ = normal alternative to the caramel gene
ca = caramel mutant gene.
+//+ = two normal genes (normal)
+//ca = normal gene and caramel gene = het pied (looks normal)
ca//ca = two caramel genes (caramel appearance

+ = normal alternative to the pied gene
ca = pied mutant gene.
+//+ = two normal genes (normal)
+//pi = normal gene and pied gene = het pied (looks normal)
pi//pi = two pied genes (pied appearance

double het caramel/pied (+//ca +//pi) x double het caramel/pied (+//ca +//pi)
1/16 +//+ +//+ (normal)
2/16 +//+ +//pi (normal looking, het pied)
1/16 +//+ pi//pi (pied)
2/16 +//ca +//+ (normal looking, het caramel)
4/16 +//ca +//pi (normal looking, double het caramel/pied)
2/16 +//ca pi//pi (pied, het caramel)
1/16 ca//ca +//+ (caramel)
2/16 ca//ca +//pi (caramel, het pied)
1/16 ca//ca pi//pi (caramel pied)

Or:
916 normal (66% probability het caramel, 66% probability het pied)
3/16 caramel (66% probability het pied)
3/16 pied (66% probability het caramel)
1/16 caramel pied
The fractions are the probability of an outcome per baby. They are not the probability per clutch.