If the embryos of a mating do not develop properly and die, thus preventing the offspring of two different species from continuing to reproduce, they are an example of
A. behavioral isolating mechanisms.
B. mechanical isolating mechanisms.
C. biochemical isolating mechanisms.
D. hybrid inviability.
D. hybrid inviability.
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An organism that is unable to move on its own power is said to be
a. sessile. b. a zygote. c. sedentary. d. a larva. e. a gamete.
Based on Figure 50-1, which of the following cells is diploid?
a. 2
b. 3
c. 4
d. 5
e. 6
What is the effect of a nonsense mutation in a gene?
A. It introduces a premature stop codon into the mRNA. B. It alters the reading frame of the mRNA. C. It has no effect on the amino acid sequence of the encoded protein. D. It prevents introns from being excised. E. It changes an amino acid in the encoded protein.
Which group of animals is the most recent to evolve?
A) reptiles B) amphibians C) invertebrates D) mammals