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: Custom 10th Edition for University of South Florida
- What causes sexual dimorphism? Give some examples of sexually dimorphic species, and why you think that form of sexual dimorphism arose.arrow_forwardEnumerate 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_forwardIs sexual reproduction required to generate the variability in structures and behaviors that is necessary for natural selection?arrow_forward
- How can we account for the extensive differences between the two species?arrow_forwardIn the context of the evolutionary relationship among ants, wasps, and bees, how come that these insects have shared common characteristics?arrow_forwardWhich of the following is a problem with using the Biological Species Concept? A. it doesn't apply to asexual populations B. It doesn't apply to tropical organisms C. it doesn't take into account reproductive compatibility D. there are no issues with this species conceptarrow_forward
- why do the embryos of different species resemble each other?arrow_forwardHow could changes in the environment affect populations of species with temperature-dependent sex determination?arrow_forwardDo all dioecious species have a homogametic and a heterogametic sex? 1. Yes, because dioecious means that two types of gametes are produced, even in hermaphroditic species. 2. Yes, because all sex-determining systems include heterogametic and homogametic sexes. 3. Yes, because in dioecious organisms, either the XX-XY or the ZZ-ZW system determines sex. XY and ZW individuals are heterogametic. XX and ZZ individuals are homogametic. 4. No, because hermaphrodites and species that reproduce asexually are dioecious. 5. No, because dioecious means that the sexes are separate, regardless of how sex is determined. In some dioecious species, sex is determined by a single gene.arrow_forward
- different sexes can be confirmed by studying living species. How could you look for evidence of sexual dimorphism in the fossil record? How could you distinguish this from ontogenetic differences (i.e. juveniles vs. adults)?arrow_forwardIs the sexual dimorphism of the early hominins more similar to a primate like the gorilla or to a primate like the human? What can we conclude, therefore, about the mating strategies of these early hominins?arrow_forwardMany species can reproduce either asexually or sexually. Explain what you think might be the evolutionary significance of the switch from asexual to sexual reproduction that occurs in some organisms when the environment becomes unfavorable.arrow_forward
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