Biology: Unit 6 | Lesson 3 | CONCEPT OF SPECIES

morphology

The form or appearance of an organism. The collection of physical characteristics and the structure which make up an organism. A basis for species definition.

reproductive isolation

The separation of populations of organisms by some type of barrier to produce variations of species. No reproduction or exchange of genes occurs between the separated groups. A basis for species definition.

The concept of reproductive isolation relates more toward genetic _____ to distinguish between species. differences appearance similarities

differences

Computerized analysis of the "Lucy" type fossil has: helped to add objectivity to the classification of fossil taxa. shown that Australopithecus africanus is not a primate. indicated a distinct link between the genus Homo and Australopithecus.

helped to add objectivity to the classification of fossil taxa

Which of the two methods for determining the species taxon would involve greater subjectivity? both are completely objective morphology reproductive isolation

morphology

The taxon "species" may be defined by which of the following concepts? genetic differences morphology reproductive isolation organization

morphology reproductive isolation

Are horses and donkeys of the same species? no, according to morphology yes, according to reproductive isolation no, according to reproductive isolation yes, according to morphology

no, according to reproductive isolation yes, according to morphology

The classification of species by morphology involves: age shape colors reproduction physical traits structure

shape colors physical traits structure

The complexity of life, combined with our limited knowledge: is overcome by the science of taxonomy. is circumvented by objective analysis. sometimes prevents conclusive classification. always prevents classification.

sometimes prevents conclusive classification

The lowest rank of taxa is the _____. genus species order

species

If you were to classify the many breeds of dogs by morphology, what would be inferred regarding species? the numerous varieties might be classified as distinct species the numerous varieties would be considered one species

the numerous varieties might be classified as distinct species

Regarding the relationship of horses to donkeys: they are identical species according to the concept of morphology they are separate species according to the concept of reproduction they are separate species according to both definitions of species they are identical species according to both definitions of species

they are identical species according to the concept of morphology they are separate species according to the concept of reproduction

The exact boundaries, limitations, and meaning of species is now known and agreed upon universally. True False

False

A subjective piece of information depends more on _____; an objective piece of information depends more on _____. a scientist's feelings actual observations

A subjective piece of information depends more on a scientist's feelings; an objective piece of information depends more on actual observations.

What is the genus of the popular fossils which are similar to "Lucy"? Australopithecus primates africanus Homo

Australopithecus

Taxonomy is a rigorous, objective science. True False

False

Horses and donkeys are not of the same species when defined by reproductive isolation because: Offspring of a horse and donkey have a unique morphology. They are unable to interbreed. Offspring of a horse and donkey are unable to reproduce. They do not have similar morphology.

Offspring of a horse and donkey are unable to reproduce.

According to reproductive isolation, all the varieties of dogs would be considered as one species. True False

True

subjective

With bias. Thoughts or interpretations based on the feelings and personal evaluations of the scientist.