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Evolution and Genetics Task 5: What makes human typically human? $7.01   Add to cart

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Evolution and Genetics Task 5: What makes human typically human?

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It is the summary of Task 5. It has all the notes from the mandatory literature textbook (Nettle and Cartwright) It has the summary of the last lecture of the course. It also includes the summary of the mandatory articles: 1) Supporting document I: Is fruit-eating responsible for big b...

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  • May 27, 2022
  • 20
  • 2020/2021
  • Class notes
  • Mike gerards
  • Tutorial 5
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humans recognize bilateral kin (maternal and paternal) as well as affines (relatives through
marriage).



Task 5:

6.3 Brain Size:

The relative size of brain: the ratio of brain mass to body mass




Allometry: when an organism increases in size, the parts would not increase in
proportion to mass or volume



One variable Y (such as brain size, gestation period) can be related to a more fundamental
one X (usually body size) by an equation:

Y = 𝐶𝑋 !
C AND K ARE CONSTANTS

Brain size = C (Body size)




b

, - We lie well above the allometric line seen for other mammals.
o According to the equation, for a 65 kg our brains should weigh about 265 g. In reality, it
weighs 1300g.




The departure of brain size from the allometric line is known as the encephalization quotient
(EQ)

"#$%"& ()"*+ ,-*./$
EQ =
()"*+ ,-*./$ 0)-1*#$-1 2)34 "&&34-$)*# &*+-

, → Cooking may have been the key
to increasing calorific and
nutritional inputs without
exceeding ecological limits for
feeding time.
→If we didn’t cook, we would
2 Basic Strategies to fuel the high-energy demanding brains: have to spend more than 9 hours a
day to feed ourselves




Cooperative breeding is very
rare in other animals




The increased energy is channeled to the brain
instead of other organs which shows that the brain
was in a strong selective pressure at that time

Growing with slower
reproduction rates, and
diverting the energy to the
brain growth instead.




renewing diet with more varieties for a
balanced diet by using cognitive
power

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