Explain how the allele for sickle cell disease, which is a harmful allele when a person is homozygous, can be beneficial when a person is heterozygous.

What respiratory illness can be caused by bacteria?

Fat is necessary to proper body function. a. True b. False

Consider the gravity of the four spheres. If we wanted sphere C to attract the other three spheres seen here, what is one feature of sphere C we must change?

The mutagens that result in cancer damage DNA by

Suppose a population is carrying a condition controlled by two alleles: R (dominant) and r (recessive).

How do cells acquire positional information about their location in a developing embryo?

Which kind of solution is the concentration of solutes the same inside and outside if the cell

Identify the two primary fluids found within the eye. which one of these fluids provides nutrients to the rest of the eye

How are microscopes advantageous to scientist? name two examples when a biologist (or other scientist) may use a microscope?

Some geneticists study the genes that control bone development to try to understand bone growth and find cures for diseases. How is this different from an orthopedist (a doctor who specializes in bones) ? A.