The human genome
A. has no foreign DNA because it is excised by DNase.
B. has a very small amount of foreign DNA, mostly in the end caps (telomeres) of chromosomes.
C. has a lot of foreign DNA, mostly in the end caps (telomeres) of chromosomes.
D. has a lot of foreign DNA scattered throughout the genome, including transposons.
D. has a lot of foreign DNA scattered throughout the genome, including transposons.
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Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
A. epistasis. B. nondisjunction. C. crossing over. D. pleiotropy. E. chromosome inactivation.
Males of many moth species have very large and elaborate antennae. These large antennae
A. enhance sensitivity for finding rotting food. B. enhance sensitivity for finding flowers in bloom. C. enhance sensitivity to sexual pheromones from females. D. enhance sensitivity to compounds emitted by other males that are important in sexual competition. E. serve an important aerodynamic function during flight.
Explain how the loss of heterozygosity (LOH) leads a cell to become cancerous. What will be an ideal response?
Both extremes of an array of phenotypes are favored in ________.
A. disruptive selection B. genetic drift C. directional selection D. stabilizing selection E. gene flow