Mammalia

Question 1

Name the 5 characteristics that are only present in mammals where there are no exceptions

Answer 1

Mammary glands
Hair
Neocortex
3 middle ear bones
single lower jaw bone

Question 2

What does vivipary mean and what is the group of mammals that is an exception

Answer 2

Giving birth to live young

Monotremes are the exception because they are oviporous- meaning they lay eggs

Question 3

Which two groups of mammals don’t have a complex placenta

Answer 3

Monotremes and Marsupials

Question 4

Mammals evolved from a group of reptiles called?

Answer 4

synopsids

Question 5

In what era did small shrew-like mammals first appear

Answer 5

Triassic

Question 6

What is the group Prototheria

Answer 6

Monotremes- egg-laying

Question 7

What is the group Metotheria

Answer 7

marsupials- pouch development

Question 8

what is the group Eutheria

Answer 8

Placental mammals

Question 9

How many orders and species of mammals are there

Answer 9

27 orders

6500 species

Question 10

Chiroptera- what are they

Answer 10

Bats-forelimbs have evolved into webbed wings

1400 species

Question 11

Rodentia- what are they

Answer 11

Rodents- mice, rats, capybara
They have one pair of continuously growing incisors
most diverse order (2500 species)

Question 12

Cetacea-what are they

Answer 12

Whales, dolphins and porpoises

forelimbs have been modified into flippers

Question 13

what is monogamy

Answer 13

Exclusive mating
<5% of species do it
occurs in hunting species where make ranges overlap with only one female and the male needs to stay around to provide for the offspring

Question 14

What is polygyny

Answer 14

One male mates with multiple females

Question 15

What is polyandry

Answer 15

One female mates with many males

Question 16

What is polygyandry

Answer 16

both sexes have multiple partners

Brown antechinus

Question 17

Name the stages of the spectrum of social systems

Answer 17

Solitary life - top predators
Semi-sociality - temp. groups for prot. reproduction, warmth
Sociality - hang around together, don’t work together
Communal breeding - shared parental care, most adults breed
Cooperative breeding - only small proportion of males breed e.g. primates
Eusociality - mole-rats