BIO220H1 Lecture 12: Lecture 12 Human-Agricultural Coevolution

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11 Apr 2012

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Human infants depend on milk: lactase production normally declines in adulthood, exception: people of north european origin, decline in lactase lactose intolerance , wild type: lactose intolerance in adulthood. Lactase persistence: lactase production persists through adulthood, allowing digestion of milk. Evolution in european cattle farming cultures: observation: changes in lactase gene correlated with ability to digest lactose as, hypothesis: substitutions are causal variants, they were formed by natural selection adult. If substitutions in lactase gene cause lactase persistence, other human populations with lactase persistence would have same substitutions, or changes with similar consequences. Change vs. determinism: single events can be due to change alone or o deterministic processes. Independent lines of evidence can confirm deterministic explanations by rejecting chance. Independent evolution of same trait in different groups: groups can be population or species, allow more confident determination that selection is at work, appears to use same genes.

Related Questions

What causes lactose intolerance in humans?

Lack of glucose in the adult intestine

Lack of lactase in the adult intestine

Lack of lactose in the adult intestine

Lack of lactase in the infant intestine

indigojackal331

What normally happens to the levels of lactase produced throughout a personâs lifetime?

What is translation?

Using your knowledge of activators and repressors, hypothesize two ways in which transcription of the LCT gene

could be turned off.

Explain the effect of the mutation that occurs among northern European people on LCT gene expression.

What are the similarities and differences between the lactase persistence mutations found in Africanpopulations and the one found in European populations? (Consider, for example, type of mutation, location,

function.)

Most adult humans lose the ability to digest dairy products, a condition known as lactose-intolerance because of an inactivity of the lactase enzyme for digestion. However, there is a high degree of lactose tolerant people who are from northern European descent. How can you explain lactose tolerance from a âchemicalâ perspective and why would there be a greater frequency from northern Europe?

Epulos, a bacterium growing in the gut of tropical surgeon fish can reach the size of 500 micrometers. How does this compare to other bacteria and what problems does this present the epulos? What are some ways that a cell this size could alter its structure to survive?

BIO220H1 Lecture 12: Lecture 12 Human-Agricultural Coevolution

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