Theme 2 Origin Of Multicellularity

Question 1

What is symbiotic multicellularity theory

Answer 1

That multiple diff cells form a symbiosis but still each have diff dna and function

Question 2

What is syncytial multicellularity theory

Answer 2

One unicellular cell split it’s nucleus and then subdivided, then each division took on a diff function.

Question 3

What is colonial multicellularity theory

Answer 3

Many identical unicellular came together and underwent cell adhesion

Then they differentiated and developed diff functions together

Question 4

What is the most likely theory of complex multicellularity

Answer 4

Colouonal theiry

Question 5

What are the advantages of multicellularity

Answer 5

Division of labour (cells can do specific functions)

Increase size (but less surface area)

Avoidance of predation, can eat larger prey

Storage of fat

Enhanced motility

Increased traction (more control of where to go)

Protected internal environment (reacts to external environment to remain homeostasis

Predator/prey host/parasite interactions (symbiotic interactions)

More opportunities for niches

Question 6

What is the predation hypothesis

Answer 6

In a situation without a predator, the cell sometimes retains daughter cells to get bigger or releases them

In the premise of a predator the cell retain is cells, if predator is taken away the cell still retains its cells

This tells us that the predator isn’t eating the daughter cells but something else