These two figures illustrate two lineages with two variants, with and without a black spot. In all situations, a split illustrates the descendants of an individual. In which situation can natural selection work?
a. In the diagram on the left, because natural selection has eliminated the spotted variant.
b. In the diagram on the left, because the number of offspring produced is independent of muta-tion.
c. In the diagram on the right, because variation is heritable.
d. In the diagram on the right, because mutation does not influence reproduction.
C
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A protein that binds DNA at a specific promoter or enhancer region in order to regulate RNA production is called a _________________ factor.
Fill in the blank(s) with the appropriate word(s).
List the 9 characteristics that living things share
What will be an ideal response?
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by _____
A) hydrogen bonds B) nonpolar covalent bonds C) polar covalent bonds D) ionic bonds
Sea cucumbers will ____ when environmental conditions deteriorate
a. eject their digestive tract, respiratory structures, and gonads b. crawl to an area with more favorable conditions c. form a resistant spore d. float to the surface and then later drop to a more favorable location e. crawl deep into the ocean mud on the bottom