Most gymnosperms are pollinated by wind, whereas most angiosperms are pollinated by ________
Fill in the blank(s) with correct word
animals
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How do gene duplication and exon shuffling lead to new genes?
What will be an ideal response?
Biological diversity is an index of the variety of living organisms in an ecosystem, and includes:a
species richness only. b. species richness, genetic diversity, and ecosystem diversity. c. species richness, biosphere diversity, and ecosystem diversity. d. population diversity and ecosystem diversity. e. genetic diversity only.
When a ________ enters a host cell, it loses the outermost protein layer and is then referred to by virologists as a double-layered particle (DLP).
Fill in the blank(s) with the appropriate word(s).
In which example are the proximate cause and the ultimate cause of morphological evolution correctly matched?
A. Proximate: point mutations in protein coding genes affect protein function and structure, ultimate: chemical and physical configuration of a protein affect its function B. Proximate: cis-regulatory elements are found upstream of a gene; ultimate: cis regulation is required to activate a gene C. Proximate: natural selection causes morphology to differ among species, ultimate: natural selection prevents morphological variation within a species D. Proximate: changes in gene regulation lead to changes in morphology; ultimate: natural selection favors morphologies that work best in their environment E. Proximate: natural selection favors gene combinations that have high fitness in their environment; ultimate: genetic changes alter morphology and fitness