The lakes of northern Minnesota are home to many similar species of damselflies of the genus Enallagma. These species have apparently undergone speciation from ancestral stock since the last glacial retreat about ten thousand years ago
Sequencing which of the following would probably be most useful in sorting out evolutionary relationships among these closely related species? A) conserved regions of nuclear DNA
B) mitochondrial DNA
C) amino acids in proteins
D) ribosomal RNA
B
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Which of the following choices would most likely promote random distribution?
A) territorial species B) species that secrete chemicals to attract or inhibit other individuals C) flocking and schooling behaviors D) spacing during the breeding season E) homogeneous chemical and physical factors in the environment
In somatic hypermutation, the mutation of immunoglobulin genes occurs at much higher rates than the mutation rates observed in other genes
Indicate whether the statement is true or false.
Organic chemicals always have a basic framework of the element ________ bonded to other atoms.
A. hydrogen B. phosphorous C. carbon D. nitrogen E. oxygen
The structure labeled 1 in Figure 27-1 is a(n):
a. homospore.
b. heterospore.
c. embryo.
d. gamete.
e. zygote.