Where do blood stem cells originate?
A) heart
B) bloodstream
C) bone marrow
D) liver
C
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The ____ are considered to be blood reservoirs
a. arteries b. arterioles c. capillaries
d. heart e. veins
What process does NOT produce variation?
a. crossing over b. random alignment of chromosomes during meiosis c. mitosis d. genetic recombination of alleles e. sexual reproduction
Scientific laws are used to describe natural events or relationships. Which scientific law explains why the gametes formed by an organism do NOT contain exactly the same alleles as alleles as the parent?
A) the law of conservation of matter B) the law of independent assortment C) the second law of thermodynamics D) the law of conservation of energy
Why did Milinski and Bakker test female choice between brighter and duller stickleback males in two different set-ups: one with unfiltered light and one with light from which red color was eliminated? The results from both trials are shown below
What will be an ideal response?