BIO220 Lecture 3 Flashcards Preview

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Flashcards in BIO220 Lecture 3 Deck (50)
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31

How to test indirect benefit hypothesis?

Female identifies preferred male trait. Mate her to ones with best trait and worst trait. Examine offspring.

32

how are sex roles defined?

Resource investment in the offspring

33

Examples of high male PI?

- Giant water bugs
- Pipefish
- Katydids
- Spotted sand piper
- Plovers

34

Pipefish male reproductive success limited by...

size of their brood pouch

35

Pipefish female reproductive success limited by...

access to males' brood pouch

36

Mating system of pipefish

Females compete and are sexually selected for by the males

37

What do male pipefish look for?

Larger females (more eggs) & large fold

38

Katydid mating system (normal)

Males transfer spermataphores to female

39

Katydid mating system (low resources)

Females need male for spermataphores, and males limited by the resources to make spermataphores.

Males become the limiting factor.
Females will be sexually selected.

40

What changes when food is scarce for katydids?

- Male calls decrease
- Females mate more
- Male mate choice increases
- Female competition increases

41

MHC

Major histocompatibility complex

42

What does MHC do?

Code for antigen recognition system of the immune system

43

HLA

Loci that code for antigen recognition (immune response)

44

MHC in humans is...

HLA

45

What kind of MHC is good?

Ones with lots of genetic variation -> defend against more pathogens

46

Why do mice choose mates based on MHC?

- Avoid inbreeding
- Increase genetic diversity at MHC loci

47

Do mice choose mates based on MHC?

Yes; mate choice based on odours that correspond with differences at MHC loci

48

Are humans affected by odours that correspond with HLA?

Yes

49

What were the results of the odour study in humans?

- Intensity of odours similar between different HLA and same HLA group
- Women prefer those with different HLA

50

How does birth control affect how attractive scents are to women?

BC makes women think she is pregnant.
Might prefer those with same HLA = offspring and family who can take care of her.