Homework Sourse1 The fur of hamsters can be described as bristly curly wavy
1. The fur of hamsters can be described as bristly, curly, wavy or smooth. Your great aunt Maribel dies and leaves you her two hamsters, one of which has a bristly coat, while the other has a wavy coat. Because hamsters are prolific breeders, you soon have more than 60 hamsters with a coat type distribution as follows (remember, all of these progeny have the same parents): 31 bristly, 34 curly. You take two of the curly offspring and mate them to each other repeatedly, obtaining 18 curly and 5 wavy furred hamsters. You take two different curly offspring (of the original pair), and do the same thing; this time you get 24 curly offspring and 7 smooth offspring. Now you have to stop,because you are overrun with hamsters.
If you crossed the original bristly parent to one of its smooth-haired grandchildren, what ratio would you expect in the offspring?
all bristly
½ bristly, ½ smooth
½ bristly, ½ curly
1/4 bristly, 1/2 curly, 1/4 smooth
none of the above
2. In cattle, individuals with the hide color dalmatian have higher protein milk, which makes them desirable. When dalmatian individuals are mated to each other, the outcome is 50% dalmation, 25% black, and 25% white. If you wanted to mass produce dalmatian cattle for sale, which type would be best to use as a breeding pair?
dalmatian male x sandy female
black male x dalmatian female
dalmatian male x dalmatian female
black male x white female
none of the above
| A. | all bristly | |
| B. | ½ bristly, ½ smooth | |
| C. | ½ bristly, ½ curly | |
| D. | 1/4 bristly, 1/2 curly, 1/4 smooth | |
| E. | none of the above |
Solution
2. In cattle, individuals with the hide color dalmatian have higher protein milk, which makes them desirable. When dalmatian individuals are mated to each other, the outcome is 50% dalmation, 25% black, and 25% white. If you wanted to mass produce dalmatian cattle for sale, which type would be best to use as a breeding pair?
D-BLACK ALLELE------
White allele-------d
dalmatian individuals Dd x dalmatian individuals Dd x
50% dalmation, ----------Dd
25% black,---DD
and
25% white.--dd
A.
dalmatian male x sandy female
B.
black male x dalmatian female
C.
dalmatian male x dalmatian female
D.
black male x white female--------------answer
DD X dd
Dd-------- dalmatian
E.
none of the above
====================================
The fur of hamsters can be described as bristly, curly, wavy or smooth. Your great aunt Maribel dies and leaves you her two hamsters, one of which has a bristly coat, while the other has a wavy coat. Because hamsters are prolific breeders, you soon have more than 60 hamsters with a coat type distribution as follows (remember, all of these progeny have the same parents):
F1
31 bristly,
34 curly.
You take two of the curly offspring and mate them to each other repeatedly
,
F2
CURLY X CURLY
Obtaining
18 curly
And
5 wavy furred hamsters.
F2
CURY X CRULY
get 24 curly offspring and 7 smooth offspring.
Now you have to stop,because you are overrun with hamsters.
If you crossed the original bristly parent to one of its smooth-haired grandchildren, what ratio would you expect in the offspring?
A.
all bristly
B.
½ bristly, ½ smooth
C.
½ bristly, ½ curly
D.
1/4 bristly, 1/2 curly, 1/4 smooth
E.
none of the above----------------------answer
explanation
smooth-haired grandchildren ----- bbww
B/b; W/w X ----- bbww
1/4 bristly, 1/4 curly, 1/4 wavy, 1/4 smooth---correct -------answer
| A. | dalmatian male x sandy female | ||||||||||||||||
| B. | black male x dalmatian female | ||||||||||||||||
| C. | dalmatian male x dalmatian female | ||||||||||||||||
| D. | black male x white female--------------answer DD X dd Dd-------- dalmatian | ||||||||||||||||
| E. | none of the above ==================================== The fur of hamsters can be described as bristly, curly, wavy or smooth. Your great aunt Maribel dies and leaves you her two hamsters, one of which has a bristly coat, while the other has a wavy coat. Because hamsters are prolific breeders, you soon have more than 60 hamsters with a coat type distribution as follows (remember, all of these progeny have the same parents): F1 31 bristly, 34 curly. You take two of the curly offspring and mate them to each other repeatedly , F2 CURLY X CURLY Obtaining 18 curly And 5 wavy furred hamsters. F2 CURY X CRULY get 24 curly offspring and 7 smooth offspring. Now you have to stop,because you are overrun with hamsters. If you crossed the original bristly parent to one of its smooth-haired grandchildren, what ratio would you expect in the offspring?
explanation smooth-haired grandchildren ----- bbww B/b; W/w X ----- bbww 1/4 bristly, 1/4 curly, 1/4 wavy, 1/4 smooth---correct -------answer |
