Lecture 29 - History of Animal Life on Earth Flashcards Preview

BISC 120 > Lecture 29 - History of Animal Life on Earth > Flashcards

Flashcards in Lecture 29 - History of Animal Life on Earth Deck (23):
1

What domain are animals in?

Eurkarya

2

Are animals multi or uni cellular?

multicellular

3

What are animals held together by?

collagen

4

Do animals have cell walls?

no

5

How do animals reproduce?

sexually

6

Which stage is the dominating stage of the lifecycle in animals?

diploid stage

7

What are the 5 basic stages of sexual reproduction/

1. fertilization
2. zygote
3. cleavage
4. blastula
5. gastrula

8

What specialized genes do animals have?

hox genes

9

What are the 5 characteristics of an animal?

1. Multicellular, heterotrophic eukaroytes
2. Lack cell walls of plants + fungi
3. Two unique tissues: nerves + muscles
4. Sexual reproduction, diploid adult stage
5. Have homeotic (Hox) genes regulating early development

10

What are larva?

-sexually immature
-morphologically/ecologically distinct from adult

11

Larvae eventually undergo __________

metamorphosis

12

What are the 2 types of symmetry?

1. Radial (diplobaslatic)
2. Bilateral (tripoblastic)

13

What are the 3 germ layers?

1. ectoderm
2. endoderm
3. mesoderm (only in tripblastic)

14

What are 2 types of development?

1. protosome (spiral)
-blastopore becomes mouth
2. deuterosome
-blastopore becomes anus

15

What is the common ancestor for all animals?

choanoflagellates

16

What are the 3 types of body cavites?

1. coelomates (true cavity derived from mesoderm)
2. pseudocoelomates (derived from mesoderm + endoderm)
3. acoelomates

17

What may have been the first vertebrates to leave water?

lungfish relatives

18

What are the 4 major Eras?

1. Neoproterozoic
2. Paleozoic
3. Mesozoic
4. Cenozoic

19

What was the neoproterozic era?

-First evidence of early animal embryos + predation
-included Ediacaran

20

What was the main feature of the paleozoic era?

Cambrian Explosion
-earliest fossil appearance of many major groups of living animals

21

What are 3 reasons for the Cambrian explosion?

1. hox genes
2. oxygen
3. predation

22

What are 3 defining features of the mesozoic era?

1. Coral reefs
2. Dinosaurs were dominant terrestrial vertebrates
3. First mammals emerged, flowers/insects diversified

23

What are 3 defining features of the cenozoic era?

1. Mass extinctions of both terrestrial + marine animals (nonflying dinosaurs, marine reptiles)
2. Diversifications of mammals
3. Global climate cooled