There are more than 30 blood group genes in humans, in addition to the ABO locus. This increases ________ in human populations.
A. gene flow
B. homozygosity
C. genetic variability
D. founder effects
E. selective mating
Answer: C
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Substitution of one base pair for another in a coding region of a gene can result in a ____ mutation where a codon
specifying an amino acid is changed to a stop codon.
a. missense b. chromosomal c. frameshift d. silent e. nonsense
Which of the following best describes the presence of gill structures in vertebrate embryos and tail structures in embryos in the great apes?
a. These are vestigial structures that are residual parts from a past common ancestor. b. These structures continue to be necessary for survival in the adult form of these organisms. c. These structures show that these species have been isolated since the separation of the supercontinent Gondwana. d. Vertebrate organisms are more closely related to fish than to marsupials.
The "all-or-none principle" states that in a given muscle, all of the cells are contracting simultaneously or none of them is contracting
Indicate whether the statement is true or false
Maize transposons were originally discovered because their transposition resulted in
a. loss of a chromosomal fragment. b. insertion of a chromosomal segment. c. point mutations in a pigment gene. d. inversion of a chromosomal segment. e. hybrid dysgenesis.