How does a gene tree differ from a species tree?
A) A gene tree shows the relationships among all the genes in a species genome, whereas a species tree shows the relationships among species.
B) A gene tree is based on gene sequences, whereas a species tree is based on morphological features of each species.
C) A gene tree is a phylogeny of individual genes, and can include multiple genes from a single species and/or samples of the same gene from multiple species; in a species tree, each species is represented by only a single branch.
D) A gene tree is a subcategory of species tree, in which the data used to create the tree comes from gene sequences.
C
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If a pea plant strain is true-breeding for a particular trait, then:
A. crosses between two true-breeding plants with the same trait will have offspring identical to the parents. B. it will be homozygous for all genes. C. it must be a recessive trait. D. it is not useful for studying inheritance. E. it only self-fertilizes.
The width of a DNA double helix ____
a. is constant b. is narrower where adenine is present than where cytosine is present c. is wider where purines are present than where pyrimidines are present d. varies randomly e. is wider where pyrimidines are present than where purines are present
Reef systems
a. be all be destroyed within 30 years. b. are formed from calcium carbonate secreted by coral polyps. c. have symbiotic dinoflagellates in the living coral. d. have shown widespread bleaching; death of corals is being reported worldwide. e. include all of these.
Which portion of the brain is the main regulator of internal organs?
a. hypothalamus b. cerebellum c. cerebrum d. thalamus e. pons