Reports due Exam 3 take- home available soon Due Th 4/28.
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Transcript of Reports due Exam 3 take- home available soon Due Th 4/28.
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Reports due
Exam 3 take-home available soonDue Th 4/28
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Choosing a mate and reproductive strategies are based on methods to succesfully pass on
genes
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VolesPrairie
• Monogamous
• Both parents care for young
Montane
• Nonmonogamous
• Mother cares for young briefly
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Oxytocin(hormone)
Water/salt balance
Contraction of womb and milk production
Encourages bonding between individuals
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Hormones are molecules produced in one cell and signal another.
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Oxytocin(hormone)
Water/salt balance
Contraction of womb and milk production
Encourages bonding between individuals
![Page 7: Reports due Exam 3 take- home available soon Due Th 4/28.](https://reader035.fdocuments.net/reader035/viewer/2022081520/56649ccd5503460f94997398/html5/thumbnails/7.jpg)
VolesPrairie
• Monogamous
• Both parents care for young
Montane
• Nonmonogamous
• Mother cares for young briefly
![Page 8: Reports due Exam 3 take- home available soon Due Th 4/28.](https://reader035.fdocuments.net/reader035/viewer/2022081520/56649ccd5503460f94997398/html5/thumbnails/8.jpg)
VolesPrairie
• Monogamous
• Both parents care for young
Montane
• Nonmonogamous
• Mother cares for young briefly
Same levels of oxytocin
![Page 9: Reports due Exam 3 take- home available soon Due Th 4/28.](https://reader035.fdocuments.net/reader035/viewer/2022081520/56649ccd5503460f94997398/html5/thumbnails/9.jpg)
Hormones are molecules produced in one cell and signal another.
![Page 10: Reports due Exam 3 take- home available soon Due Th 4/28.](https://reader035.fdocuments.net/reader035/viewer/2022081520/56649ccd5503460f94997398/html5/thumbnails/10.jpg)
VolesPrairie
• Monogamous
• Both parents care for young
• More receptors
Montane
• Nonmonogamous
• Mother cares for young briefly
• Less receptorsSame levels of oxytocin
![Page 11: Reports due Exam 3 take- home available soon Due Th 4/28.](https://reader035.fdocuments.net/reader035/viewer/2022081520/56649ccd5503460f94997398/html5/thumbnails/11.jpg)
VolesPrairie
• Monogamous
• Both parents care for young
• More receptors
• ?
Montane
• Nonmonogamous
• Mother cares for young briefly
• Less receptors
• ?
Same levels of oxytocin
Inject hormone into brain
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VolesPrairie
• Monogamous
• Both parents care for young
• More receptors
• Monogamous
Montane
• Nonmonogamous
• Mother cares for young briefly
• Less receptors
• Nonmonogamous
Same levels of oxytocin
Inject hormone into brain
![Page 13: Reports due Exam 3 take- home available soon Due Th 4/28.](https://reader035.fdocuments.net/reader035/viewer/2022081520/56649ccd5503460f94997398/html5/thumbnails/13.jpg)
VolesPrairie
• Monogamous• Both parents care
for young
• More oxytocin receptors
• ?
Montane• Nonmonogamous• Mother cares for
young briefly
• Less oxytocin receptors
• ?
Same levels of oxytocin
Block receptors
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VolesPrairie
• Monogamous• Both parents care
for young
• More oxytocin receptors
• Nonmonogamous
Montane• Nonmonogamous• Mother cares for
young briefly
• Less oxytocin receptors
• Nonmonogamous
Same levels of oxytocin
Block receptors
![Page 15: Reports due Exam 3 take- home available soon Due Th 4/28.](https://reader035.fdocuments.net/reader035/viewer/2022081520/56649ccd5503460f94997398/html5/thumbnails/15.jpg)
VolesPrairie
• Monogamous• Both parents care
for young
• More oxytocin receptors
• Monogamous
Montane• Nonmonogamous• Mother cares for
young briefly
• Less oxytocin receptors
• Monogamous
Same levels of oxytocin
Increase levels of receptors (genetically) in ventral pallidum
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VolesPrairie
• Monogamous
• Both parents care for young
• More receptors
Montane
• Nonmonogamous
• Mother cares for young briefly
• Less receptorsSame levels of oxytocin
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Sexual Dimorphism
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Human Females:~1 egg/month
Human Males:250,000,000 sperm/ ejaculation
Fig 46.12
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I hope Pat likes my feathers because I am tired of dragging them
around everywhere.
Fig 23.15
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1
2
Which is male?
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1
2
Which is male?
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Sexual Dimporphism: morphological differences between males and females
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Sexual Dimorphism
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Male barn swallows have longer tails than females
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Why do males have long tails?From “Biological Science” 3rd ed. by Scott Freeman -fig 51.5
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Why do males have long tails?
From “Biological Science” 3rd ed. by Scott Freeman -fig 51.5
feathers cut and reattached
captured and released
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Female grizzly bears cannot reproduce while lactating. Therefore they can only
reproduce every once every 3 years…
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…this leads to competition between males
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Male elephant seals compete for access to females in limited beach territories. They are on average 4 times bigger than females.Male elephant seals weigh ~3 tons.
From “Biological Science” 3rd ed. by Scott Freeman -fig 25.14
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Competition between males is fierce, only
a few males father most of the offspring.
90% of males never successfully reproduce
60% of females do not successfully reproduce
From “Biological Science” 3rd ed. by Scott Freeman -fig 25.14
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Average height/weight by sex in U.S.
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Ratio of Weight Male/Female
M/F
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Primates have different reproductive stratagies
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Testes Compared to Overall WeightTesticle size (oz) per body w
eight (lbs)
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Our closest living relative...bonobos
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http://www.youtube.com/watch?v=eubDSQrFako Stop at 1:53
http://www.ted.com/talks/lang/eng/isabel_behncke_evolution_s_gift_of_play_from_bonobo_apes_to_humans.html