Labrador Problems Extra Credit
1. Brittany is trying to analyze the genetics of a recent match she made with a yellow sire
named Cooper and a chocolate dam named Khaleesi. She would like to get chocolate labs
from the match.
a. What are Cooper and Khaleesi’s possible genotypes? (Hint: There is more than once
possible answer for both. List all possible genotypes.)
b. What genotype of the offspring would produce a chocolate color? (Hint: There is more
than one possible answer. List all possible genotypes.)
c. The B and E genes are on autosomes, so is there a greater chance of getting chocolate
puppies that are male vs. female?
d. Indicate what possible genotype(s) Cooper must be in order to get chocolate labs and
explain your reasoning.
2. Over the next four years, Brittany breeds Cooper and Khaleesi, and this results in two litters
of puppies (whelps). She carefully records her data for every whelping in a special notebook
specifically for tracking the genealogies, vaccinations, birth weights, diets, and other special
health information for all her dogs and their offspring. She observes the following data for
the number of lab puppies whelped by Cooper and Khaleesi:
a. Predict the genotypes of both Khaleesi and Cooper based on the breeding
information. Fill out the Punnett square using these genotypes and fill in the expected
percentages for each phenotype of offspring Labrador Problems Extra Credit 1. Brittany is trying to analyze the genetics of a recent match she made with a yellow sire named Cooper and a chocolate dam named Khaleesi. She would like to get chocolate labs from the match. a. What are Cooper and Khaleesi’s possible genotypes? (Hint: There is more than once possible answer for both. List all possible genotypes.) b. What genotype of the offspring would produce a chocolate color? (Hint: There is more than one possible answer. List all possible genotypes.) c. The B and E genes are on autosomes, so is there a greater chance of getting chocolate puppies that are male vs. female? d. Indicate what possible genotype(s) Cooper must be in order to get chocolate labs and explain your reasoning. 2. Over the next four years, Brittany breeds Cooper and Khaleesi, and this results in two litters of puppies (whelps). She carefully records her data for every whelping in a special notebook specifically for tracking the genealogies, vaccinations, birth weights, diets, and other special health information for all her dogs and their offspring. She observes the following data for the number of lab puppies whelped by Cooper and Khaleesi: a. Predict the genotypes of both Khaleesi and Cooper based on the breeding information. Fill out the Punnett square using these genotypes and fill in the expected percentages for each phenotype of offspring
