Topanga’s mother has blue eyes and her father has brown eyes. The allele for brown eye color is dominant (B) to the allele for blue eye color (b), but Topanga has blue eyes. Therefore, Topanga’s must be and her father’s must be Bb. a. genotype; bb
b. phenotype; Bb
c. genotype; Bb
d. phenotype; bb

a. genotype; bb

Explanation:

Given that;

The allele for brown eye color is dominant (B)  to the allele for blue eye color (b)

and Topanga’s mother has blue eyes

Definitely the traits of Topanga’s mother is recessive for blue traits = bb

Her father has brown eyes = Bb (since B is dominant over b) therefore, the b allele is not expressed.

So if Bb crosses with bb; we have:

                         B                      b

b                      Bb                      bb

b                      Bb                      bb

∴ Since Topanga has blue eyes, it is expressed by the genotype bb because bb is a recessive genotype expressing the blue eye color.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

the answer would be..

b. sucking