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Biology Of Mammals > Reproduction > Flashcards

Flashcards in Reproduction Deck (48):
1

What is viviparity?

Giving birth to live young

2

What can the baculum be used to identify?

Age and taxonomy

3

What is the simplex uterus

Entire uterus is fused into one single organ

3

What is one method of reproductive delay?

Sperm storage

4

How can reproductive suppression occur?

Suppress own Suppress others

5

What defines mammalian reproduction?

Egg-uterus relationship

5

Which species have a simplex uterus?

Higher primates

6

How does delayed development occur?

Egg is fertilised. Blastocyst implants into uterus lining

7

Why does infanticide occur?

New dominant male kills offspring to bring female back into oestrus

7

What is polygyny

Multiple females single males

8

Which species have a bipartite uterus?

Whales

8

What is parturition?

The act of giving birth to young

9

What are the characteristics monotreme reproduction?

Egg laying, single functioning ovary, cloaca, mammary glands, no nipples

10

What is the functional of epithelial spines?

Remove sperm from multiple matings

11

Which species have bicornuate uterus?

Bats and carnivores

13

What are the 2 derived characteristics of mammals?

Hair, mammary glands

14

What is the bicornuate uterus?

Heart-shaped uterus. Upper parts are separate but fused at the bottom

14

How are copulation cycles maintained?

Social and environmental cues

16

what are the characteristics marsupial reproduction?

Cloaca, basic placenta, brief gestation, long lactation, development in a pouch

17

Why do stoats have delayed implantation?

Males mate with altricial young, females arent big enough to cope with birth and to allow young to develop

17

What is Corpus luteum?

Hormone secreting structure that develops in an ovary

17

What are the stages in metatherian lactation?

Mammogenesis Early lactogenesis Late lactogenesis

18

Which 2 species lay eggs?

Platypus and echidna

19

What is polyandry?

Multiple males single female

21

In which orders are the testes abdominal?

Monotremes, Cetacea, Aenarthra, Paenungulata

21

How does delayed implantation occur?

Embryonic diapause. Blastocyst maintained in a state of dormancy

22

Why does reproductive suppress occur?

Reproduction is costly, need to maximise long term fitness

23

What is unique about the marsupial penis?

It is bifid into 2 halves

24

What are the parts of the male anatomy?

Testes, penis, baculum

25

Why is the marsupial penis the way it is?

To allow sperm to be deposited in both sides of the vagina

27

What is the baculum?

Penis bone

28

What are diphyodont teeth?

2 sets of teeth (milk and permanent)

30

What are the characteristics of eutherian reproduction?

Advanced placenta, towards nutrition transfer via lactation.

31

What are the 6 placental structures?

Eputheliochorial Syndesmochorial Endotheliochorial Hemochorial Endothelioendothelial Hemoendothelial

32

What occurs in marsupial birth?

New borns are altricial, crawl to pouch

34

Which species have a duplex uterus?

Rodents, marsupials, lagomorphs

35

What is the bipartite uterus?

2 separate uteri but share a single cervix

37

What are the 4 types of uterus?

Duplex, bipartite, bicornuate, simplex

39

What is unique about the platypus vagina?

Only the left oviduct is functional

40

Which species are the only ones with male lactation?

Dayak fruit bat

41

What is a monoestrous cycle?

One cycle per year

42

What is the bruce effect?

Female rodents terminate pregancies following exposure to the scent of unfamiliar males

43

How does sperm storage work?

Copulation before torpor, sperm heads embedded in uterus lining

44

What is the duplex uterus?

2 wholly separate uteri with one fallopian tube

45

What is a polyoestrous cycle?

More than one a year

46

What is semelparity?

Investing everything into one mating event to create best conditions and secure best female

47

What is unique about the echidna penis?

Bifid - 4 rosetters, only 2 are fucntional

48

What is the function of mammary glands?

Transfer nutrients