Question

in mice, black fur (b) is dominant over white fur (b). which of the following is not the correct method to determine if a mouse with a dominant phenotype has a homozygous or heterozygous genotype? question 23answer a. test crosses need to be conducted on a mouse with a dominant phenotype to determine their genotype. b. a mouse with a dominant phenotype should be crossed with any true breeding mouse. c. a mouse with a dominant phenotype should be crossed with a mouse with a recessive phenotype. d. the black mouse should mate with white mice.

Answer 1

The correct method to determine if a mouse with a dominant phenotype has a homozygous or heterozygous genotype is to cross it with a mouse with a recessive phenotype.

Step-by-step explanation:

The correct answer is c. A mouse with a dominant phenotype should be crossed with a mouse with a recessive phenotype. This method allows us to determine if the mouse with the dominant phenotype is homozygous or heterozygous. When a mouse with a dominant phenotype is crossed with a mouse with a recessive phenotype, the resulting offspring will reveal the genotype of the dominant mouse. If any offspring have the recessive phenotype, it indicates that the dominant mouse is heterozygous. If all offspring have the dominant phenotype, it indicates that the dominant mouse is homozygous for the dominant allele. For example, if a black mouse with a dominant phenotype is crossed with a white mouse with a recessive phenotype, and all the offspring have black fur, it suggests that the black mouse is homozygous for the dominant allele (BB).