In primrose flowers, the dominant allele of gene K is necessary to synthesize blue flower pigment. Otherwise the flowers are white. Blue pigment synthesis is inhibited by a dominant allele of gene D. In other words, plants with the genotype K-D- will not produce pigment (and their flowers will be white) because of the presence of the D allele. If two dihybrid plants (Kk Dd) are crossed what is the ratio of blue to white offspring in the progeny?

3/13

Explanation:

K_  gives blue flower pigment

kk gives white flower

The presence of D, either as K_DD or K_Dd results in white flower

Crossing 2 plants with KkDd genotype:

        KkDd   x   KkDd

Offspring:

KKD_ = 9/16 white flower

KKdd = 3/16 blue flower

kkDD = 3/16 white flower

kkdd = 1/16 white flower

Hence, the ratio of blue to white flower would be 3:13

See the attached image for the Punnet's square

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: