HL 1 Biology

5.5b Classification

<<Animal Classification>>

Animals/plants: male + female gametes fuse together and zygote is formed = develops into embryo

  • Animals:
  • the embryo develops into a solid ball of cells and then into a hollow ball of cells (blastula)
  • mouth, gut and anus + body systems (nervous/blood/skeletal systems) may develop then
  • divided into over 30 phyla based on characteristics

<<Classification of Humans>>

natural classification indicates probable evolutionary origins of a species

  • Humans:
  • order: primates
  • family: Hominidae
  • debate on weather great apes are in the same family

========Chapter 18 Questions=============================

1) Bryophyta: top 2nd from the left, bottom 2nd from the right, bottom right

Filicinophyta: top left, top 2nd from right

Confierophyta: bottom left

Angiosperomophyta: bottom 2nd from left, top right,


2) (a) 34

(b) 24-30 and 31-33

(c) 1-7 and 8-23

(d) 1-23, 24-33, and 34

(e) 16 because they are in the same family

(f) 34 has three concentric circles drawn around it because it has different characteristics from the rest and is in the different genus/family/order than the rest.

3) (a) Mollusca has a mouth, anus, head, muscular foot but the Porifera does not have any of these features. The Porifera has many pores, yet the Mollusca do not.

(b) Annelida have exoskeleton and bristles, while the Arthropoda do not. Yet they both consist of a mouth and anus, and are segmented. Also, the Arthropoda have jointed appendages while the Annelida do not.

(c) The Cnidaria and Platyhelminthes both do not have an anus, but have a mouth and are unsegmented. The Cnidaria has a more rounder body and the Platyhelminthes has a flattened body. The Cnidaria are radially symmetric and have stinging tentacles, but the Platyhelminthes are not.

4 (a) Humans: Animalia (Kingdom), Chordata (phylum), Mammalia (class), Primate (order), Hominidae (family), Homo (genus), sapiens (species)

(b) Binomial nomenclature. There are two names; the first name (genus name) has a capital first letter and the second name (species name) has a lower first letter. The international/latin used in italics.

(c) Keys are designed to allow organisms to be identified by using two choices, dichotomous. The choices are made based on the reliable characteristics found in all the individuals. These choices are made from the visible characteristics  and help give identification.

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