The failure of chromosomes to separate during meiosis is called

a. nondisjunction.

c. Turner's syndrome.

b. X-chromosome inactivation.

d. Down syndrome.

A geneticist examines the karyotype of a diploid cell from a particular species of frog and determines that 12 chromosomes are present. If a germ-line cell from this species divides by meiosis, then at the end of meiosis I each cell will have

During DNA replication, the enzyme DNA Helo case function to A) unzips and unwind the strand of DNA. B) match the correct base C) rejoin the hydrogen bonds

Which of these processes causes the release of water from living organisms into the atmosphere?

What is the abiotic factor for a grizzly bear

The blood vessels that supply blood to the heart itself are the

Which pair of factors determines the density of ocean water?

Base your answer to the following question on the statement below and on your knowledge of biology. Some internal environmental factors may interfere with the ability of an enzyme to function efficiently.

What causes the cell membrane to expand and burst

What is study of plants called?

Which process is most responsible for the increase in early Earth's atmospheric oxygen levels?