Researchers introduce DNA into plants by
using
I. bacteria
II. electric shocks
III. chemical shocks
a. I only
b. II only
c. III only
d. II and III
e. I, II, and III
E
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Adaptive radiation is
a. the basis of radiometric dating. b. development of similar body form in unrelated organisms. c. formation of beneficial alleles through exposure to radiation. d. origin of many species from a single common ancestor. e. spread of successful alleles from one population to another.
In the human male, genotype and phenotype associated with the genes on the X chromosome are determined by the one X chromosome he inherits from his mother
Indicate whether the statement is true or false
How might the allele that causes a disease stay in the population if it is fatal to those who have the disease?
a. it occurs only in certain geographic areas b. it disappears but is continuously replaced by mutations c. it is present only in heterozygotes d. it makes the heterozygote resistant to a fatal disease
A virus contains _______ as its genetic material
Fill in the blank(s) with the appropriate word(s).