Lab: Mouse Genetics (Two Traits)

Question 1

Notice that the predicted percentages and laboratory percentages are not the same. These differences most likely result from a computation errora strong linkage between the genesexpected randomnessan unusual sample.

Revolt · Accepted Answer

expected randomness

Question 2

. . . the genes assort independently.

Revolt · Accepted Answer

short, black fur; long, black fur; short, brown fur; long, brown fur

Question 3

A cross was performed, and the offspring shown to the right were produced. What is the most likely genotype for the parents?

Revolt · Accepted Answer

BbEe × BbEe

Question 4

Select all the offspring phenotypes that could be produced from a BbEE x bbee cross (shown above).

Revolt · Accepted Answer

black fur, black eyes; white fur, black eyes

Question 5

Cross a parent that is homozygous recessive for both traits (bbee) with a dihybrid (BbEe). First, draw a Punnett square in your notes. For each offspring in the Punnett square, determine the phenotype.In other words, what are the fur color and eye color? Finally, use that information to fill in the predicted fraction of each phenotype in the data table below.

Revolt · Accepted Answer

4

Question 6

⇒ 4/16

Revolt · Accepted Answer

4

Question 7

⇒ 4/16

Revolt · Accepted Answer

4

Question 8

⇒ 4/16

Revolt · Accepted Answer

4

Question 9

. . . the genes are nearby on the same chromosome.

Revolt · Accepted Answer

short, black fur; long, brown fur

Question 10

Which explanations best explain the data? Check all that apply.

Revolt · Accepted Answer

The genes for wing shape and body color are located on the same chromosome.; The genes for eye color and wing shape are on different chromosomes.

Lab: Mouse Genetics (Two Traits) Answers

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