Concept explainers
To determine: The types of organisms that do not fit easily into the biological species concept.
Introduction The process that involves in the generation of new and unique forms of life is referred to as
To determine: The species concept that would work best for asexual organisms.
Introduction The process that involves in the generation of new and unique forms of life is referred to as speciation. A species indicate a closed gene pool, in which various alleles are shared only among the members of that species. In general, alleles are not shared with the members of other species. The most widely accepted and used the definition of a species is called the biological species concept (BSC). Ernst Mayr (1904 – 2005), the great evolutionary biologist, described the BSC.
As the biological species concept is based on reproduction, obviously this concept cannot be applied to extinct species that are known through fossil records alone. For example, various “species” of dinosaurs and trilobites.
Morphospecies concept: This concept states that members belonging to the same species generally look alike. Thus, the similarities in the morphological characters of the given group of organisms can be used to determine species (all belong to a single species or two different species). This concept can be applied for extinct as well as asexual species.
Phylogenetic species concept (PSC): This concept accentuates that all the members belonging to a species share a common fate and common ancestry. This concept can be applied for extinct as well as asexual species.
Ecological species concept (ESC): This concept states that there is an exclusive connection between a niche and its species. ESC can be used to describe asexual species on the basis of its ecological characteristics, such as its nutritional needs.
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Chapter 21 Solutions
BIOLOGY: HOW LIFE WORKS (HC+LAUNCHPAD)
- What is the opening indicated by the pointer? (leaf x.s.) stomate guard cell lenticel intercellular space none of thesearrow_forwardIdentify the indicated tissue? (stem x.s.) parenchyma collenchyma sclerenchyma ○ xylem ○ phloem none of thesearrow_forwardWhere did this structure originate from? (Salix branch root) epidermis cortex endodermis pericycle vascular cylinderarrow_forward
- Identify the indicated tissue. (Tilia stem x.s.) parenchyma collenchyma sclerenchyma xylem phloem none of thesearrow_forwardIdentify the indicated structure. (Cucurbita stem l.s.) pit lenticel stomate tendril none of thesearrow_forwardIdentify the specific cell? (Zebrina leaf peel) vessel element sieve element companion cell tracheid guard cell subsidiary cell none of thesearrow_forward
- What type of cells flank the opening on either side? (leaf x.s.) vessel elements sieve elements companion cells tracheids guard cells none of thesearrow_forwardWhat specific cell is indicated. (Cucurbita stem I.s.) vessel element sieve element O companion cell tracheid guard cell none of thesearrow_forwardWhat specific cell is indicated? (Aristolochia stem x.s.) vessel element sieve element ○ companion cell O O O O O tracheid O guard cell none of thesearrow_forward
- Identify the tissue. parenchyma collenchyma sclerenchyma ○ xylem O phloem O none of thesearrow_forwardPlease answer q3arrow_forwardRespond to the following in a minimum of 175 words: How might CRISPR-Cas 9 be used in research or, eventually, therapeutically in patients? What are some potential ethical issues associated with using this technology? Do the advantages of using this technology outweigh the disadvantages (or vice versa)? Explain your position.arrow_forward
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