Which of the following statements about homologous chromosomes is correct?
a. each gene is at the same locus on both chromosomes.
b. they are two identical copies of a parent chromosome which are attached to one another at the centromere.
c. they always produce identical phenotypes.
d. they are chromosomes that have identical genes and alleles.

Using meiosis, the sporophyte produces spores that are .

Which of the following is required of a new drug?me

How do temperature and salinity affect deepwater currents? they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water.