A pear plant with the genotype Aa can produce gametes containing:a
either A or Aa.
b. only the dominant A.
c. only the recessive a.
d. either A or a.
e. either AA, Aa, or aa.
d
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What cell type is responsible for the formation of the blood-brain barrier?
A. oligodendrocytes B. interneurons C. Schwann cells D. astrocytes
Darwin’s primary scientific achievement was identifying the ____
a. method for estimating the age of fossils b. idea that organisms change over time and form new species c. process by which genes are passed from one generation to the next d. concept of gene pools and changes in allele frequencies e. mechanism by which populations of organisms change over time
In angiosperms, where does pollen production take place?
a. megasporangium b. antipodal cells c. microsporangium d. synergid cells
Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have times more DNA than G1 phase cells. The cells of this group are _____
A) between the G1 and S phases in the cell cycle B) in the G2 phase of the cell cycle C) in the M phase of the cell cycle D) in the S phase of the cell cycle