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Lab: Mouse Genetics (One Trait) Answers

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In the cross Bb x Bb (two heterozygous mice), what percentage of the offspring would you predict to have the same phenotype as the parents?

A
0%
B
25%
C
50%
D
75%
E
100%
2
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Suppose that you had a male mouse with black eyes and a female mouse with red eyes. You know that the allele for black eyes is dominant, and you want to determine whether the male is heterozygous.

Answers:
Suppose that you had a male mouse with black eyes and a female mouse with red eyes. You know that the allele for black eyes is dominant, and you want to determine whether the male is heterozygous.:test cross
Suppose that you had a male mouse with black eyes and a female mouse with red eyes. You know that the allele for black eyes is dominant, and you want to determine whether the male is heterozygous.:50% to 50%
3

way that this can happen is if their genotypes are both bbBBBb.

A
bb
B
BB
C
Bb
4

Therefore, both parents pass the Bbbb allele to every offspring.

A
B
B
b
C
bb
5

When you combine two of these alleles, the resulting genotype is bbBBBb; therefore, the resulting offspring have white fur.

A
bb
B
BB
C
Bb
6

There are genes that govern the eye color of mice, too. Suppose that a true-breeding mouse with red eyes is crossed with a true-breeding mouse with black eyes. All of the offspring mice have black eyes. What can you conclude? The allele for red eyes is dominant.The allele for black eyes is dominant.Neither. You need more data.

A
The allele for red eyes is dominant.
B
The allele for black eyes is dominant.
C
Neither. You need more data.
7

25%50%✔ 75%100%

Answers:
Your prediction is that of the offspring would have the dominant phenotype, and of the offspring would have the recessive phenotype.:75%
Your prediction is that of the offspring would have the dominant phenotype, and of the offspring would have the recessive phenotype.:25%
8

What is the probability that the couple would have a child that was also a carrier for sickle cell anemia?

A
0%
B
25%
C
50%
D
75%
E
100%
9

Question text not available

Answers:
Your prediction is that of the offspring would have the dominant phenotype, and of the offspring would have the recessive phenotype.:75%
Your prediction is that of the offspring would have the dominant phenotype, and of the offspring would have the recessive phenotype.:25%
10

You confirmed the above in steps 1 through 3, in which you changed the ✔ genotypesphenotypesinheritance of the

Answers:
of the:genotypes
, of the offspring.:phenotypes
11

In general, did the simulated mice align with your predictions from the Punnett squares? ✔ YesNo

A
✔ Yes
B
No
12

If you crossed two mice with white fur, what distribution of fur color would you expect in the offspring?

A
about 50% black and 50% white
B
about 75% black and 50% white
C
100% white
D
100% black
13

Justify your answer by filling in the blanks. Both parents have white fur. OneThe most likelyThe only

A
One
B
The most likely
C
The only
14

Next, you perform a cross with a mouse with black fur and a mouse with white fur. Which result(s) for the offspring would confirm that the mouse with black fur was heterozygous?

A
4 mice with black fur
B
8 mice with black fur, 1 mouse with white fur
C
5 mice with black fur, 6 mice with white fur
D
6 mice with black fur, 2 mice with white fur
15

To do so, you would do a test crosssimulationPunnett square. Breed

A
test cross
B
simulation
C
Punnett square
16

You make a Punnett square for a cross and find the results shown below. A Punnett square is shown. The columns are labeled Upper X and x for male. The rows are labeled Upper X and x for female. Clockwise from upper left the boxes contain: Homozygous dominant, Heterozygous, Homozygous recessive, heterozygous.

A
0%
B
25%
C
50%
D
75%
17

parents and predicted the fur color, or genotypes✔ phenotypesinheritance, of the offspring.

A
genotypes
B
✔ phenotypes
C
inheritance
18

Error Analysis: What might be the reason that some of your percentages didn’t exactly match your predicted results?

A
Gametes aren’t responsible for inheritance.
B
Mice don’t have large litters, so the sample size was not large enough.
C
The wrong type of mice were used.
19

them and look for approximately a 100% to 0%75% to 25%50% to 50%25% to 75%0% to 100% ratio of black eyes to red eyes.

A
100% to 0%
B
75% to 25%
C
50% to 50%
D
25% to 75%
E
0% to 100%
20

In steps 4 and 5, you reversed the process. You were shown the parents and offspring above. You did a experimental cross✔ test crosscross breed to identify the genotypes of the parents

A
experimental cross
B
✔ test cross
C
cross breed

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