Question

1. in ostriches, there are 2 types: ones that run fast and those that run slowly. the fast birds can reach up to 40 miles an hour. jackals love to eat ostrich, and they can reach speeds of up to 35 - 40 miles per hour. a flock of ostrich will lay ~ 10 eggs, but many rodents break into the eggs and eat the fetus before they hatch.

a. what ostrich will natural selection select against? ostriches that run slowly. for? ostriches that run fast. a population will change over time.
darwins 5 points: identify the 5 points in the scenario above.
population has variations.
some variations are favorable.
more offspring are produced than survive.
those that survive have favorable traits.

Explanation:

• Natural Selection Against and For:
• Natural selection selects against traits that reduce an organism's chances of survival and reproduction. Jackals (predators) have speeds up to 35 - 40 miles per hour. Ostriches that run slowly would be more likely to be caught by jackals, so natural selection selects against slow - running ostriches.
• Ostriches that run fast have a better chance of escaping jackals (a favorable trait for survival), so natural selection selects for fast - running ostriches.
• Darwin's 5 Points:
• Population has variations: There are two types of ostriches - those that run fast and those that run slowly.
• Some variations are favorable: The fast - running trait is favorable as it helps ostriches escape jackals (predators).
• More offspring are produced than survive: A flock of ostrich lays ~10 eggs, but many rodents break into the eggs and eat the fetus before they hatch.
• Those that survive have favorable traits: Ostriches that survive (assuming they are the ones that can reproduce) are likely to be the fast - running ones (since they can escape predators better).
• A population will change over time: Over generations, if fast - running ostriches are more likely to survive and reproduce, the proportion of fast - running ostriches in the population will increase.

Answer:

• a.
• Against: Ostriches that run slowly
• For: Ostriches that run fast
• Darwin's 5 points:
• Population has variations: There are fast - running and slow - running ostriches.
• Some variations are favorable: Fast - running is favorable for escaping jackals.
• More offspring are produced than survive: ~10 eggs laid but many eggs are predated.
• Those that survive have favorable traits: Surviving ostriches (to reproductive age) are likely fast - running.
• A population will change over time: Fast - running ostriches will become more common.