A species of birds from South America have feathers that are either blue, black, or both blue and black. There are only two alleles for the gene that codes for feather's color, A and U. Allele A controls black color, and the allele U controls blue color. The birds with blue and black feathers fully express the alleles A and U. Most likely, A and U are alleles. Dominant
Recessive
Codominant
Incomplete dominant

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed

What is genetic variation? -(a) each individual in a population has slightly different genes. -(b) some individuals in a population have more genes than others. -(c) each population of a species has slightly different genes. -(d)some populations of a species have more genes than others.

Describe surface tension in a group of bonded water molecules