An amniocentesis is a medical procedure that is used to detect many genetic disorders in humans before birth. The karyotype below shows the number and
structure of homologous pairs of chromosomes in a body cell of a human fetus taken
from this medical procedure.
What caused the chromosomal alteration in number 21?

A) a part of a chromosome was lost (deletion)
B) a duplicated chromosome failed to separate (nondisjunction)
C) part of the chromosome attached to another chromosome (translocation)
D) some of the genes on a chromosome were reversed (inversion)

How do temperature and salinity affect deepwater currents? question 15 options: 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 changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them.