When the expression of a trait is influenced by the action of many genes, the pattern of inheritance is called
A) discontinuous variation.
B) complete dominance.
C) multiple alleles.
D) polygenic inheritance.
E) incomplete dominance.
D
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Which type of mapping was made possible by technology that allowed exact base pair distances between markers to be measured?
a. cytogenetic mapping b. sequence mapping c. radiation hybrid mapping d. linkage mapping
Who developed the two-part naming system
scientists use today to classify newly found organisms?
a. Charles Darwin b. Carolus Linnaeus c. Aristotle d. Alexander von Humboldt e. Ernst Mayer
Which factor has so far kept gene therapy from becoming an effective treatment for genetic disorders?
A.) the difficulty of getting new genes to become part of a cell's DNA B.) the complexity of sequencing the entire human genome c.) the lack of success in finding genes that are responsible for genetic disorders D.) the ethical questions about making transgenic humans
What percentage of the earth's land area is currently used for crops or permanent pastures?
A) 1% B) 2% C) 5% D) 10% E) 35%