Explain how Mendel’s law of segregation applies to the distribution of alleles in gametes.
What will be an ideal response?
Each diploid organism contains two alleles for each trait. The alleles will be separated (through segregation) into different gametes.
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Chromosomes exchange genetic information by
A. fertilization. B. mitosis. C. syngamy. D. DNA replication. E. crossing over.
The differences in evolutionary rates of change revealed by relative rate tests may be attributable to
A) differential strength of selection. B) generation time. C) average DNA repair efficiency. D) differential exposure to mutagens. E) All of these
What is a disadvantage of the exoskeleton?
a. It cannot be replaced if damaged. b. It must be shed to accommodate growth. c. It is easily penetrated by predators. d. It requires high ATP levels for continuous growth. e. It does not permit movement of the organism.
Why have plants been implicated in the Ordovician and Devonian glaciations, but not the Proterozoic glaciations?
A. Land plants had not yet evolved during the Proterozoic. B. Proterozoic plants had simple root structures that did not increase rock weathering. C. Proterozoic plants used anoxygenic photosynthesis. D. The nonvascular plants present during the Proterozoic did not contribute to global nutrient cycles.