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 (11th Edition)
- 8) What data would suggest that a species evolutionary history includes sexual selection as a mechanism that helped shape the species? A) If males and females are significantly different from each other (sexual dimporphism) B) If some males reproduce with multiple females while other males do not reproduce C) If males engage in "risky" behavior D) If males and females form different social groups (i.e. herds are formed from either males or females but not both)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_forwardWhat data would suggest that a species evolutionary history includes sexual selection as a mechanism that helped shape the species? If males and females are significantly different from each other (sexual dimporphism) If males and females form different social groups (i.e. herds are formed from either males or females but not both) If some males reproduce with multiple females while other males do not reproduce If males engage in "risky" behaviorarrow_forwardAre the following primates (same species) exhibiting sexual dimorphism? Explain your reasoning:arrow_forward
- What causes sexual dimorphism? Give some examples of sexually dimorphic species, and why you think that form of sexual dimorphism arose.arrow_forwardPlease use and cite any source(s) you can find to answer the following questions:1. List and describe the different ways in which species are defined.2. Explain how each of the following makes it difficult to clearly define a species: variation within aspecies, geographically isolated populations, asexual species, fossil organisms.3. List and describe the pre-zygotic barriers as well as the post-zygotic barriers.4. Explain why allopatric speciation would be less likely on an island close to a mainland than on a moreisolated island.arrow_forwardReview 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_forward
- Scientists 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_forwardgive 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_forward
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