Discussion on dominant and recessive alleles

Discussion on dominant and recessive alleles
Which of the following most accurately states the effect of selection
on the frequency of dominant versus recessive alleles?
(A) Dominant alleles are subject to selection even at low
frequencies.
(A) Lethal, recessive alleles’ frequencies reach zero if selected
against for a long enough time.
(B) Dominant alleles are more affected by negative than positive
selection.
(C) Recessive alleles are more subject to selection than dominant
alleles because there is only one genotype for the recessive
phenotype.
55. Fragments from a small meteorite that fell to Earth approximately
one hundred million years after Earth formed were found to contain
more than 80 amino acids. Which of the following true statements is
the best evidence that the amino acids were not contaminants from
organisms from Earth?
(A) The proportions of amino acids found in the meteorite were
similar to those produced in the Miller–Urey experiment
(showing that organic molecules can be synthesized from
inorganic precursors).
(B) The amino acids were present in equal amounts of D- and L-
isomers (mirror image enantiomers), but organisms on Earth can
only make and use L-isomers (with rare exceptions).
(C) There are only 20 amino acids that make up proteins in
organisms.
(D) Molecules exposed to extreme conditions often undergo
chemical changes.
56. Which of the following true statements does not support the idea that
RNA was likely the first genetic material?
(A) Cells typically contain about 8 times more RNA than DNA.
(B) RNA plays a central, informational role in protein synthesis.
(C) RNA can replicate by Watson–Crick base pairing rules.
(D) Single-stranded RNA molecules can take on a variety of three-
dimensional shapes and can
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