Concept And Uses Of Classification Systems
Gbogbo ọrọ náà
There are millions of different kinds of organism on Earth. To make sense of this variety, biologists sort living things into groups, a process called classification. A good system does more than tidy the shelves: it groups organisms by the features they truly share, and even reflects how closely they are related through evolution.
In this lesson you will learn what a species is, how the two-part binomial naming system avoids worldwide confusion, and how to build and use a dichotomous key. You will also see, at Extended level, how DNA base sequences now give the most objective measure of relatedness of all.
Ebumnobi
- State that organisms can be classified into groups by the features that they share
- Describe a species as a group of organisms that can reproduce to produce fertile offspring
- Describe the binomial system of naming species as an internationally agreed system in which the scientific name of an organism is made up of two parts showing the genus and species
- Construct and use dichotomous keys based on identifiable features
- [Supplement] Explain that classification systems aim to reflect evolutionary relationships
- [Supplement] Explain that the sequences of bases in DNA are used as a means of classification
- [Supplement] Explain that groups of organisms which share a more recent ancestor (are more closely related) have base sequences in DNA that are more similar than those that share only a distant ancestor
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Akwụkwọ Ọmụmụ
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Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Concept And Uses Of Classification Systems. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- Which is the correct way to write a binomial name? A. panthera Leo B. Panthera leo C. PANTHERA LEO D. Panthera Leo Answer: B
- A species is best defined as a group of organisms that: A. look exactly the same B. live in the same place C. can reproduce to produce fertile offspring D. share a common name Answer: C
- A dichotomous key is made up of: A. random questions B. pairs of contrasting statements C. a single description D. coloured pictures Answer: B
- In a binomial name, the first part shows the: A. species B. kingdom C. genus D. order Answer: C
- Two species share a recent common ancestor. Their DNA base sequences are likely to be: A. completely different B. more similar than distantly related species C. identical D. unrelated to ancestry Answer: B
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Akụkụ akwụkwọ
Organizing Life on Earth
Discuss the need for a comprehensive classification system
"Biology: Organizing Life on Earth" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/biology/pages/20-1-organizing-life-on-earth. Access for free at https://openstax.org/books/biology/pages/1-introduction
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