Which of the choices gives the correct sequence of early embryonic development in Drosophila?
A) zygote, syncytial blastoderm, multinucleate syncytium, cellular blastoderm
B) zygote, cellular blastoderm, syncytial blastoderm, multinucleate syncytium
C) zygote, multinucleate syncytium, syncytial blastoderm, cellular blastoderm
D) syncytial blastoderm, multinucleate syncytium, zygote, cellular blastoderm
C) zygote, multinucleate syncytium, syncytial blastoderm, cellular blastoderm
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In Chapter 3, you learned about the evolution of the 14 finch-like species on the Galapagos
Islands. As shown in the figure below, each species has a different beak shape; thus, each
species is adapted to feeding on different food sources.
Parents with the dominant phenotype cannot have offspring with the recessive phenotype.
A. False, because both parents could carry the recessive allele. B. True, because the dominant gene must be passed down from each parent. C. False, because one parent could carry the recessive allele. D. True, because at least one dominant gene will be passed down from each parent. E. True, because both parents have the dominant allele.
The same bees that pollinate the flowers of the Brazil nut trees also pollinate orchids, which are epiphytes (in other words, plants that grow on other plants); however, orchids cannot grow on Brazil nut trees. These observations explain _____
A) the coevolution of Brazil nut trees and orchids B) why Brazil nut trees do not set fruit in monoculture plantations C) why male orchid bees do not pollinate Brazil nut tree flowers D) why male orchid bees are smaller than female orchid bees
With a light microscope, observation of which of the following would allow discrimination between a prokaryote and a eukarkyote?
a. the cell membrane b. a nucleus c. flagella d. a cell wall