Pure-breeding brown Labrador retrievers were crossed with pure-breeding yellow l

Question

Pure-breeding brown Labrador retrievers were crossed with pure-breeding yellow labs. Which of the following offspring combinations are possible? In guinea pigs, coat color is determined by three unlinked genes; Color (C) is dominant to albino (c). Brown (B) is dominant to bay (b), and Full color (D) is dominant to pale (d). Pigs heterozygous for all three genes are crossed. What is the probability of getting a pale, bay guinea pig? Based on the information in Question 24, what proportion of the offspring will have the same genotype as their parents?

Explanation / Answer

Answer. WHEN A YELLOW LAB CROSSES WITH A BROWN LAB

Here are the color possibilities

1.   Yellow and black puppies

2.   All puppies are black

3.   Yellow, black, and brown puppies

4.   Black and brown puppies

5.   Yellow and brown puppies

6.   All puppies are brown

Answer. In guinea pigs the coat color is determined by three unlinked genes where Color (C) is dominant to albino (c), Brown (B) is dominant to bay (b) while Full color (D) is dominant to pale (d)

c. 9/64

Answer. Offspring having same genotype as parents.

e.27/64

Answer. WHEN A YELLOW LAB CROSSES WITH A BROWN LAB

Here are the color possibilities

1.   Yellow and black puppies

2.   All puppies are black

3.   Yellow, black, and brown puppies

4.   Black and brown puppies

5.   Yellow and brown puppies

6.   All puppies are brown

Answer. In guinea pigs the coat color is determined by three unlinked genes where Color (C) is dominant to albino (c), Brown (B) is dominant to bay (b) while Full color (D) is dominant to pale (d)

c. 9/64

Answer. Offspring having same genotype as parents.

e.27/64

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