Two true-breeding minuscule dessert mice with gray fur mated and produced a litter of 20 F1 mice. All of them have black fur. When these F1 mated with each other, they produced a total of 256 F2 progeny with the following phenotypic distribution: 144 black, 96
gray, and 16 white.
21. (True/False) The fur color of this species is determined by one gene.
22. How many different genotypes can be found among 96 gray F2?
a. 1
b. 2
с. 3
d. 4
e None of these above 23. (True/False) The number of different genotypes among the black F2 is equal to the number
of different genotypes among the gray F2. 24. Among 96 gray F2, how many of them are breed true?
a. 0
b. 16
c. 32
d. 48
e. None of these above