Which of the following is unique to mitosis and not a part of meiosis?
A) Homologous chromosomes behave independently.
B) Homologous chromosomes cross over.
C) Chromatids are separated during anaphase.
D) Homologous chromosomes pair, forming bivalents.
A
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Fundamental similarity due to descent from a common ancestor is called
A. homology. B. analogy. C. commonality. D. convergence. E. analogy and convergence are correct.
The protection provided through transfer of antibodies from mother to fetus is an example of
A. active immunity. B. passive immunity. C. cell-mediated immunity. D. clonal selection. E. autoimmunity.
Which of the following statements is NOT true?
a In asexual reproduction, the parent passes a complete set of genes to its offspring. b. In sexual reproduction, both meiosis and fertilization must occur during the life cycle. c. In sexual reproduction, a human offspring receives two genes for every trait. d. Sexual reproduction puts together new combinations of genes. e. Sexual reproduction produces clones.
What major agricultural innovation in the early twentieth century allowed for production of far more food on arable land?
A) genetically modified crops B) concentration of carbon fertilizer C) industrial nitrogen fixation D) use of fish as fertilizer E) the discovery of crop rotation