Consider the cross AaBbCC × AABbCc.
Use a Punnett square to predict the expected ratio of offspring phenotypes.

Question

Consider the cross AaBbCC × AABbCc.

Use a Punnett square to predict the expected ratio of offspring phenotypes.

Accepted Answer

Hey, everyone. Let's take a look at this question together. If a brown, long haired dog is crossed with a white short haired dog, what will be the phenotype of their offspring? So let's take a look at a pundit square crossing, the brown long haired dog with the white shorthaired dog to figure out what the phenotype of their offspring will be. So we know that we have a gene for both color as well as hair length. And we have an allele for brown color, which is represented as capital B. So that will be brown and little B represents white color. And then we also have hair length, which is represented as capital C for short hair length. N, lower case C for long hair length, which means that brown is a dominant color and white is a recessive color as well as short being the dominant length and long being the recessive length. So let's go ahead and set up our punt square to see what a cross between the two would look like. So on your screen, you can see our punt square where we have the brown long haired dog at the top and on the side, we have our white short haired dog and let's go ahead and fill out the rest of this pundit square to figure out what the phenotype of their offspring will be. So on your screen, you can see what the pundit square would look like when we cross that brown, long haired dog with the white shorthaired dog. And we end up with 100% of the same phenotype, which is that capital B lowercase B, capital C lowercase C, which we note that the capital B is represented as the brown color and the capital C is represented as a short color because the allele for brown color is dominant and the allele for short length is dominant. So that means that the phenotype of the offspring between these two dogs is answer choice C brown and short hair. Because when we cross a brown, long haired dog with a white shorthaired dog, we end up with 100% of the offspring being brown and shorthaired, which is answer choice C. The correct answer. I hope you found this video to be helpful. Thank you and goodbye.

Consider the cross AaBbCC × AABbCc.
Use a Punnett square to predict the expected ratio of offspring phenotypes.

Verified video answer for a similar problem:

Key Concepts

Punnett Square

Genotype and Phenotype

Mendelian Inheritance