Research done in the 1930s and 1940s—now known as the modern or evolutionary synthesis—included ex-perimental work in genetics that demonstrated:
a. genes are particulate and do not blend.
b. mutations are one source of genetic variation.
c. there is no difference between genetic variants that generate large or small phenotypic varia-tion.
d. All of the above.
D
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When a crossover occurs within the inversion loop of a pericentric inversion, each recombinant chromatid will have (Select all that apply.)
A) a dicentric bridge. B) a duplication of some genes in the inverted region. C) a deletion of some genes in the inverted region. D) one copy of each gene, with some genes in a different order than normal. E) one copy of each gene in the normal order.
Which offspring in the illustration below are
homozygous recessive for both traits? a. A b. B c. C d. D e. none of these
Darwin recognized that female preference for showy colors based on inheritance causes these male
traits to become more common over time. ________ Indicate whether the statement is true or false.
A chlorophyll molecule has a porphyrin ring containing a single atom of:
a. manganese. b. magnesium. c. phosphorus. d. nitrogen. e. iron.