What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
A) There is considerable genetic variation in garden peas.
B) Traits are inherited in discrete units, and are not the results of ?blending.?
C) Recessive genes occur more frequently in the F1 than do dominant ones.
D) Genes are composed of DNA.
E) An organism that is homozygous for many recessive traits is at a disadvantage.
Ans: B) Traits are inherited in discrete units, and are not the results of ?blending.?
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In establishing paternity by DNA fingerprinting, what proportion of microsatellite repeat alleles in a child come from the father?
A) only those on the X chromosome B) 1/4 C) 1/2 D) 3/4
Which of the following statements is true regarding polyploidy in plants?
A. Autopolyploids are thought to be derived from plants of the same species. B. Allopolyploids are thought to be derived from plants of the same species. C. Polyploidy is more likely to be seen in mammals than plants. D. Hybridization events between plants cannot result in an alteration of chromosomal number.
The nonequilibrium created by ____ represents a renewing source of energy
a. temperature gradients b. acidic ocean vents c. alkaline ocean vents d. radioactive decay e. protocell formation
Amphibians are not completely free to live on dry land because
A. their reproduction depends on water. B. they can escape from predators by jumping into the water. C. their food organisms live in water. D. their ancestors were fish. E. they obtain oxygen from water through gills.