HEREDITY
MONOHYBRID CROSS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Black fur on mice is dominant over brown hair on mice, which is recessive. If a homozygous (BB) mouse and a another heterozygous mouse (Bb) was crossed, then what is the chance of a baby of the two mice being heterozygous?
|
|
0 %
|
|
|
25 %
|
|
|
50 %
|
|
|
75 %
|
Explanation:
Detailed explanation-1: -In mice, black fur (B) is dominant to brown fur (b) and a short tail (T) is dominant to a long tail (t). Two mice with the genotype BbTt have two separate litters of offspring together.
Detailed explanation-2: -Thus the mating of two heterozygous black mice produces the expected ratio of 3 black : 1 brown offspring.
Detailed explanation-3: -White mice have the genotype bb.
Detailed explanation-4: -If all the offspring have black fur, the parental black mouse genotype is homozygous.
There is 1 question to complete.