Interview
All subjects in one book neet and jee exam foundation
- Cours
- Établissement
You can study all the subjects in one book mainly focusing on jee and neet exam foundation
[Montrer plus]
Vendeur
S'abonner
aravindjayan
Aperçu du contenu
Unit 1.2 – Classification of organismsClassification – meaning and significance
Classification means putting things into groups.
The main reason for classifying living things is to make it easier to study them.
Earlier, scientists used to classify organisms on the basis of their morphological and anatomical features.
We still use these methods of classification today. But we now have new tools like DNA analysis for more
accuracy in the procedure.
1. Explain how DNA analysis is helpful in classification?
a. DNA is the chemical from which our chromosomes are made.
b. It is the genetic material, passed on from one generation to the next.
c. Each DNA molecule is made up of strings of smaller molecules, containing four different bases.
d. These bases, called A, C, G and T, can be arranged in any order.
e. Biologists can compare the sequences of bases in the DNA of organisms from two different species.
f. The more similar the base sequences, the more closely related the species are to one another.
g. They have a more recent common ancestor than species that have DNA base sequences that are less
similar.
The classification system of Carl Linnaeus
The first person to try to classify organisms in a scientific way was a Swedish naturalist called Linnaeus.
He introduced his system of classification in 1735.
He divided all the different kinds of living things into groups called species.
He recognised 12000 different species.
Linnaeus's species were groups of organisms that shared the same appearance and behaviour.
2. Define the term species:-
a. Organisms belong to the same species if they can breed together successfully, and the offspring that
they produce can also breed.
(Species is a group of organisms that can reproduce and produce fertile offspring)
Classification levels - from species to Kingdom
Species
Species are grouped into larger groups called genera (singular: genus).
Genus
(Each genus contains several species with similar characteristics)
Several genera are then grouped into a family Families
Families into orders
Orders
Orders into classes
Classes into phyla and Classes
Finally phyla into kingdoms.
Phyla
Kingdoms
,The binomial naming system
Binomial system is an internationally agreed system in which the scientific name of an organism is made up of
two parts showing the genus and species.
Linnaeus gave every species of living organism two names, written in Latin. This is called the binomial system.
The first name is the name of the genus the organism belongs to, & always has a capital letter (first letter only).
The second name is the name of its species, and always has a small letter (all small letters).
For example, a wolf belongs to the genus Canis and the species lupus.
Its binomial is Canis lupus.
These names are printed in italics. When you write a Latin name, you cannot write in italics, so you should
underline it instead.
The genus name can be abbreviated like this: C. lupus.
More examples-
o Dog - Canis familiaris
o Wolf - Canis lupus
o Jackal - Canis mesomelas
o Pony - Equus caballus
o Zebra - Equus burchelli
, 3. The table shows how two organisms a monarch butterfly and a giant pangolin are classified.
a. Use the information in the table to suggest whether these two organisms are not related at all, distantly
related or closely related. Explain how you made your decision.
Monarch butterfly Giant pangolin
b. Write down the genus of the giant pangolin.
o Manis
c. Use the Internet to find out how a human is classified. Write it down in a table.
Kingdom Animals
Phylum Vertebrate
Class Mammals
Order Primates
Family Hominids
Genus Homo
Species sapiens
Les avantages d'acheter des résumés chez Stuvia:
Qualité garantie par les avis des clients
Les clients de Stuvia ont évalués plus de 700 000 résumés. C'est comme ça que vous savez que vous achetez les meilleurs documents.
L’achat facile et rapide
Vous pouvez payer rapidement avec iDeal, carte de crédit ou Stuvia-crédit pour les résumés. Il n'y a pas d'adhésion nécessaire.
Focus sur l’essentiel
Vos camarades écrivent eux-mêmes les notes d’étude, c’est pourquoi les documents sont toujours fiables et à jour. Cela garantit que vous arrivez rapidement au coeur du matériel.
Foire aux questions
Qu'est-ce que j'obtiens en achetant ce document ?
Vous obtenez un PDF, disponible immédiatement après votre achat. Le document acheté est accessible à tout moment, n'importe où et indéfiniment via votre profil.
Garantie de remboursement : comment ça marche ?
Notre garantie de satisfaction garantit que vous trouverez toujours un document d'étude qui vous convient. Vous remplissez un formulaire et notre équipe du service client s'occupe du reste.
Auprès de qui est-ce que j'achète ce résumé ?
Stuvia est une place de marché. Alors, vous n'achetez donc pas ce document chez nous, mais auprès du vendeur aravindjayan. Stuvia facilite les paiements au vendeur.
Est-ce que j'aurai un abonnement?
Non, vous n'achetez ce résumé que pour €5,24. Vous n'êtes lié à rien après votre achat.
Peut-on faire confiance à Stuvia ?
4.6 étoiles sur Google & Trustpilot (+1000 avis)
71241 résumés ont été vendus ces 30 derniers jours
Fondée en 2010, la référence pour acheter des résumés depuis déjà 15 ans
Récemment vu par vous
Examen ·
lecture A intro pt centered care Questions & answers
Notes de cours ·
Aantekeningen hoorcolleges BURGERLIJK RECHT 3 (2017/2018)
Examen ·
A-Level Edexcel Mathematics Mechanics Markscheme 2023
Examen ·
Chem 103 Lab Exam 3 Questions & Answers 100% Accurate!
Examen ·
ATI PN PHARMACOLOGY PROCTORED EXAM TEST BANK 2021/2022
Examen ·
FINAL EXAM SET - CMN 568 QUESTIONS AND ANSWERS GRADED A
Examen ·
Busmhr 3200 Exam #2 Questions With 100% Correct Answers
Examen ·
RAD Midterm 1 TCDHA Questions With Complete Solutions
