In 1953, who developed the model that is shown below?

james watson and francis crick
marshall nirenberg and heinrich matthaei
rosalind franklin
erwin chargaff

How does the study of genetic disorders such as pku biologists understand normal alleles?

Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?

If there are 350 trout found in 200 square feet of a pond measuring 1000 square feet what is the estimated trout population of the pond? a. 1350 b. 1550 c. 1750 d. 2000