With the exception of cancer cells, most cells divide approximately ________ times before they stop reproducing
A) 2-4
B) 10-12
C) 20-25
D) 50-90
E) 100-200
D
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In primroses, the dominant allele of gene K is necessary to synthesize blue flower pigment. Blue pigment synthesis is inhibited by a dominant allele of gene D. In other words, plants with the genotype K- D- will not produce pigment (and their flowers will be white) because of the presence of the D allele. If two dihybrid plants (Kk Dd) are crossed, what is the ratio of blue to white offspring in the progeny?
A) 3 blue: 1 white B) 7 blue: 9 white C) 4 blue: 12 white D) 3 blue: 13 white E) 1 blue: 15 white
Sperm
a. are male gametes. b. are female gametes. c. contain yolk. d. are produced in the ovaries.
After his return to England, Darwin pondered which of the following questions most heavily?
a. What could explain the great numbers and variety of species? b. Does the fossil evidence support uniformitarianism? c. Are the extinct and living armadillos the same species? d. Did Galápagos mockinbirds have a common mainland ancestor? e. Will natural selection work in England?
To which era do these fossils belong?
A) Mesozoic B) Cenozoic C) Precambrian D) Paleozoic