Dihybrid cross involving dog coat color
Not what you're looking for?
Labrador retrievers may be black, brown, or golden in color. While each color may breed true, many different outcomes occur if numerous litters are examined from a variety of matings, where the parents are not necessarily true-breeding. The results below show some of the possibilities. Propose a mode of inheritance that consistent with these data, and indicate the corresponding genotypes of parents in each mating. Indicate as well the genotypes of the dogs that breed true for each color.
A: black x brown = all black
B: black x brown = ½ black, ½ brown
C: black x brown = ¾ black, ¼ golden
D: black x golden = all black
E: black x golden = 4/8 golden, 3/8 black, 1/8 brown
F: black x golden = 2/4 golden, ¼ black, ¼ brown
G: brown x brown = ¾ brown, ¼ golden
H: black x black = 9/16 black, 4/16 golden, 3/16 brown
Purchase this Solution
Solution Summary
Explanation of how to decipher allele and gene relations in dog coat color example with Punnett squares to explain all test crosses.
Solution Preview
To start to solve this problem we much first look at the clues presented.
- 3 variations (black, brown and golden) for one trait (coat color) which indicates either co-dominance/incomplete dominance or a multi-gene trait
-the phenotype ratios with a 16 as a denominator is a dead give away that this is a two gene trait
Now we have two genes ...
Purchase this Solution
Free BrainMass Quizzes
Pregnancy Knowledge
How much do you know about being pregnant? Test your Pregnancy IQ with this quiz!
Parts of the Brain
This quiz will test your knowledge on different areas of the brain.
Creating a Birth Plan
Preparing for a birth and want to make sure that you're including all the right information? Use this quiz to get on the right track and check your birth plan knowledge!
The Transfer of Energy in an Ecosystem
This quiz will assess your knowledge of how energy is transferred in an ecosystem and the different levels of trophic organization.
Hemophilia: Fact or Fiction
Do you know the truth about hemophilia? Test your knowledge here.