Concept explainers
(a)
To identify: The species concept(s) that can be applied to sexual and asexual species both.
Concept introduction:
The word “species” has been defined differently on the basis of three main species concepts namely; “Biological Species Concept”, “Morphological species Concept”, and “Ecological Species Concept”. According to the “Biological species concept”, a group of population with interbreeding members to produce viable fertile offspring is called species. Human beings are one of the best examples of biological species concept as they belong to the same species. In the “morphological species concept”, the species can be differentiated by their body shapes and other structural features whereas; in the “ecological species concept” the species can be defined by their ecological niche.
(b)
To explain: The most useful concept to identify species in the field.
Concept introduction:
The word “species” has been defined differently on the basis of three main species concepts namely; “Biological Species Concept”, “Morphological species Concept”, and “Ecological Species Concept”. According to the “Biological species concept”, a group of population with interbreeding members to produce viable fertile offspring is called species. Human beings are one of the best examples of biological species concept as they belong to the same species. In the “morphological species concept”, the species can be differentiated by their body shapes and other structural features whereas; in the “ecological species concept” the species can be defined by their ecological niche.
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Campbell Biology (10th Edition)
- With your knowledge of sexual selection theory, can you formulate a hypothesis that explains why female courtship might have evolved in this species? Is there anything about pipefish biology that might support your hypothesis?arrow_forwardDescribe thoroughly the selective advantages and disadvantages organisms that reproduce sexually have over those that reproduce asexually, as well as the ramifications of mate choice on the traits present in species. The following questions could help answer the question above. What are the advantages of sexual reproduction? What are the disadvantages? How do traits selected by sexual selection and those selected by differential survival mix in an animal species? i.e. is it more important to mate or survive? Use specific examples to illustrate your point. Your answers should indicate an understanding of the mechanism behind natural selection. Propose a scenario where asexual reproduction would be favorable.arrow_forwardWhich of the following sexual traits is LEAST likely to have evolved due to male-male competition for mates, also known as intraspecific sexual selection?a) Enlarged femurs that an insect uses to kick other malesb) Brushes on the tip of a dragonfly penis used to remove sperm of other malesc) Mate-guarding behavior of a warbler during the female’s fertile periodd) Elongated tails of the male swordtail fish used during courtshiparrow_forward
- Enumerate and give at least 5 unique mechanisms employed by organisms in order to determine the sex of the offspring. In each case, give an example of a species which represent such a scheme of producing sex(y) descendants. Put reference Mechanism Example 1 2 3 4 5 What evolutionary forces drive the turnover of these sex determination mechanisms?arrow_forwardAre the following primates (same species) exhibiting sexual dimorphism? Explain your reasoning:arrow_forwardWhat causes sexual dimorphism? Give some examples of sexually dimorphic species, and why you think that form of sexual dimorphism arose.arrow_forward
- Review View Help Editing A BI U v Ev E E E E A Question 3 Females are usually the limiting sexual resource in populations. A) True B) False Question 10 options: is intraspecific variation due to environmental differences during development as opposed to genetic differences. (2 words)arrow_forwardScientists studying reproduction compared three closely related species of bagworm moths. The reproductive methods for these species are given in the table. Which of the following research questions would provide additional information about the population level impacts of meiosis and sexual reproduction? A - How do the number of D. charlottae offspring compare with the number of S. rupicolella offspring? B - Do D. charlottae and S. rupicolella populations express greater genetic diversity than D. fennicella populations? C - Are the offspring of D. fennicella genetically unique compared to the offspring of D. charlottae and S. rupicolella? D - Does crossing-over in D. fennicella result in increased genetic variation compared to D. charlottae and S. rupicolella?arrow_forwardPhalaropes are shore birds with brightly colored females and dull colored males. Females are larger than males and compete with each other for access to males. Considering sexual selection theory, select the idea(s) below that seem(s) most plausible in light of the pattern of sexual dimorphism? Pick all that apply This is a picture of a brightly colored female: O Females incubate eggs and care for the young. Males incubate eggs and care for the young Males are choosy. males are not choosyarrow_forward
- give one species that is classified or exhibit the following: sex-role reversal show a photograph of it with its sexual traits (body stuctures, behavior, etc) and how these traits help their reproduction. explainarrow_forwardExplain how sexual selection might lead to a)sexual dimorphism and b) members of one sex (usually male) having traits that do not enhance their survivalarrow_forwardBased on the biological species concept, which of the following would lead biologists to conclude that different populations of lizards were actually a single species rather than two different species? A.) lizards from the two different populations mate rarely, and produce hyrbid offspring that are sterile B.) Lizards from the two differnt populations mate during different seasons C.) Lizards from the two different populations mate regularly and produce sterile offspring D.) Lizards from the two different populations matre regularly and produce viable offspring capable of reprodarrow_forward
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