mammalian reproductive strategies
Download
Skip this Video
Download Presentation
Mammalian Reproductive Strategies

Loading in 2 Seconds...

play fullscreen
1 / 31

Mammalian Reproductive Strategies - PowerPoint PPT Presentation


  • 563 Views
  • Uploaded on

Mammalian Reproductive Strategies. Prototheria (monotremes). Metatheria (marsupials). Eutheria (placentals). Patterns of Social Behavior. Sociability: important characteristic for most primates Continuous interactions among a group of individuals. Advantages of Group Living.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Mammalian Reproductive Strategies' - victoria


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
patterns of social behavior

Patterns of Social Behavior

Sociability: important characteristic for most primates

Continuous interactions among a group of individuals

advantages of group living
Advantages of Group Living
  • 1. Observational learning.
    • Reduces necessity of individual trial-and-error learning.
  • 2. Possibile genetic resistance to disease and parasites.
  • 3. Efficient location of food resources
  • 4. Increases the reproductive fitness of group members.
slide11
Individuals are solitary
  • Males are intolerant of one another.
  • Single male establishes a large territory.
  • Contains several females
  • Each female has her own separate home range
slide12
Polygyny
  • Extensive home ranges
slide13
Multi-male; multi-female

groups

Overlapping territories

slide15
Human societies extremely diverse
  • Monogamy
  • Polygamy
    • polygyny and polyandry
  • For most of human evolution - and for most women in the world today, menstruation is a rare occurrence
  • Repetitive pregnancies and long periods of lactation
fundamental intersexual reproductive strategies
Fundamental intersexual reproductive strategies
  • Female.
  • Maximize resources available to her and her offspring.
  • Female primates spend most of their adult lives pregnant, lactating, and caring for offspring.
  • High energy demands.
  • Male.
  • Produce many offspring and make sure they are yours.
  • Non-human primates: androgen levels fluctuate in response to female receptivity.
slide17
Mammalian female reproductive cycle

Female primates

Hormonal suppression of sexual cycles

nonhuman cultural behavior
Nonhuman Cultural Behavior
  • Learned behavior shared between generations. t
  • Chimpanzees: tool use
  • Spearing of bushbabies
  • Termite fishing with modified stems and twigs.
  • Have a preconceived idea of what the finished tool needs to be in order to be useful.
  • May make the tool in advance of the opportunity for use.
  • Preparing for the future. Requires planning and forethought.
slide25
Genetic similarities and differences

Human and ape chromosomes

slide29
mtDNA

4,700 base sequence

Genes for 11 tRNAs

6 proteins

Human-chimpanzee relationship

1023 more likely than

Chimpanzee-gorilla relationship

Y DNA

Base sequence for

Testis-specific protein Y

Autosomal DNA

Base sequence of

Beta-globin gene cluster

ad