Two individuals of the same species mate and produce offspring that can mate with each other but are unable to mate with other members of the species. This is an example of ________.
A. sympatric speciation via allopolyploidy
B. sympatric speciation via disruptive selection
C. allopatric speciation via allopolyploidy
D. allopatric speciation via autopolyploidy
E. sympatric speciation via autopolyploidy
Answer: E
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When nonrandom mating occurs in a population so that individuals prefer to mate with similar individuals, allele frequencies should
A) Remain the same, but homozygotes will be overrepresented in the population. B) Remain the same, but heterozygotes will be overrepresented in the population. C) Change and heterozygotes will be overrepresented in the population. D) Change and homozygotes will be overrepresented in the population. E) Remain the same, at Hardy-Weinberg equilibrium.
In which of these mitosis phases is the replication of DNA accomplished?
This diagram shows the steps in mitosis, with labels to reference in the questions below.
A. A, which is prophase.
B. E, which is cytokinesis.
C. None of these answer choices is correct.
D. A, which is mitosis.
E. C, which is telophase.
Glands that produce secretions just before ejaculation that may function to lubricate or rinse urine from the urethra are called ________
A) prostate B) vas deferens C) bulbourethral D) endometrium
Bio" refers to a gene that governs a cell's ability to synthesize biotin from inorganic precursors. What does the designation "bio+" indicate?
a. that the bacterium is biologically inactive b. that the allele is the mutant allele c. that the bacterium is biologically active d. that the allele is normal (i.e., wild type)