AP BIOLOGY

HEREDITY

MONOHYBRID CROSS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
T4-Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What percentage of the offspring of the cross BbTt x BBtt will have black fur and long tails?
A
0%
B
25%
C
50%
D
100%
Explanation: 

Detailed explanation-1: -Short tails (T) are dominant to long tails (t). What fraction of the progeny created by crossing BbTt × BBtt will be expected to have black fur and long tails? 1/16.

Detailed explanation-2: -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-3: -The mother is homozygous dominant and the father is heterozygous . The allele for black fur is dominant and represented with the letter B. The allele for brown fur is recessive and represented with the letter b.

Detailed explanation-4: -The dominant color in mice from black and white is black. The recessive gene in the black mice is in codominant and incomplete dominance with the white allele. However, the black mice have different recessive genes.

Detailed explanation-5: -If all the offspring have black fur, the parental black mouse genotype is homozygous.

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