Darwin's Natural Selection Worksheet 1

University:
Yeshiva University
Course:
1012C | Principles of Biology
Academic year:

2019
Views:

367

Pages:

1
Author:

A Powell

Darwin’s Natural Selection Worksheet Read the following situations and identify the points of Darwin’s natural selection: Variation, Overproduction, Reproductive Advantage, and Heritability 1) There are 2 types of worms: worms that eat at night (nocturnal) and worms that eat during the day (diurnal). The birds eat during the day and seem to be eating ONLY the diurnal worms. The nocturnal worms are in their burrows during this time. Each spring when the worms reproduce, they have about 500 babies but only 100 of these 500 ever become old enough to reproduce. Darwin's points: Identify your answers from the scenario above. there are two types of word a. Populations have variations: ____________________________________________________________ the birds do not eat nocturnal worms b. More offspring are produced than survive: ______________________________________________ 100 of the original 500 worms survive to reproducing age c. Those that survive have favorable traits: _______________________________________________ only nocturnal worms survive and reproduce d. A population will change over time: ______________________________________________________ nocturnal worms e. What worm has natural selection selected AGAINST? _________________ FOR? ________________ diurnal worms 2) There are 3 types of polar bears: ones with thick coats, ones with thin coats and ones with medium coats. It is fall, soon to be winter. The temperatures are dropping rapidly, and the bears must be kept warm, or they will freeze to death. Many of the bears have had ~2 cubs each but due to the extreme temperatures, many mothers only have one cub left. Darwin's points: Identify your answers from the scenario above. there are three types of bears a. Populations have variations: _____________________________________________________________ b. More offspring are produced than survive: _______________________________________________ the coat provides warmth half of the total cubs survive c. Those that survive have favorable traits: __________________________________________________ thicker rise thin decreases d. A population will change over time: ______________________________________________________ thin e. What polar bear has natural selection selected AGAINST? _________________ FOR? ___________ thick 3)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 (each mother only lays 1), but many rodents break into the eggs and eat the fetus before they hatch. Darwin's points: Identify your answers from the scenario above. 2 types of ostrichs a. Populations have variations: _____________________________________________________________ many eggs eaten before hatched b. More offspring are produced than survive:________________________________________________ faster can survive c. Those that survive have favorable traits. __________________________________________________ faster ostrich will survive slow will not d. A population will change over time. ______________________________________________________ e. What ostrich has natural selection selected AGAINST? _________________ FOR? ______________ slow fast

Darwin's Natural Selection Worksheet 1

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