Which one of the following is not important to the concept of homology?
A. Features must share a common developmental pattern.
B. Species with homologous features must be related.
C. Homologous features must be found in a common ancestor.
D. It can include anatomical, physiological, or molecular features.
E. None of the features being compared can be vestigial.
Answer: E
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Why is gel electrophoresis so important when studying genetic variation?
A. Gel electrophoresis enables a scientist to identify dominant and recessive traits. B. Gel electrophoresis enables scientists to identify proteins of different size or charge. C. Gel electrophoresis enables scientists to replicate a strand of DNA. D. Gel electrophoresis enables a scientist to link phenotype to genotype. E. Gel electrophoresis enables a scientist to sequence DNA.
The wide-ranging effect of a single gene is called
a. heterozogosity. b. homozygosity. c. segregation. d. pleiotropy. e. co-dominance.
Regulation of development takes place mostly at the level of:
a. replication. b. transcription. c. posttranscription. d. translation. e. posttranslation
In a healthy cell, the rate of DNA repair is equal to the rate of DNA mutation. When the rate of repair lags behind the rate of mutation, what is a possible fate of the cell?
A) The cell can be transformed to a cancerous cell. B) RNA may be used instead of DNA as inheritance material. C) The cell will become embryonic. D) DNA synthesis will continue by a new mechanism.