Biology: Life on Earth with Physiology Plus Mastering Biology with Pearson eText -- Access Card Package (11th Edition)
Biology: Life on Earth with Physiology Plus Mastering Biology with Pearson eText -- Access Card Package (11th Edition)
11th Edition
ISBN: 9780133910605
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 27.5, Problem 1CSR
Summary Introduction

To determine:

Whether the elephant seals, regardless of their abundance should be considered as potentially endangered in the foreseeable future or not.

Introduction:

The population of elephant seal experiences both density-independent as well as density-dependent environmental resistances. The elephant seals are the almost genetically identical species and any adverse changes can affect the entire population to a similar degree.

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Question 3 In Genetic decline, restoration and rescue of an isolated ungulate population (Poirier et al. 2018) which of the following was NOT one of the main threats to the population prior to the translocation event? O Inbreeding depression in female lambs O Outbreeding depression from immigrant males O Predation by cougars O Low number of reproductively-capable adults Question 4 Which of the following is NOT an example of any type of coevolution discussed in lecture? Milkweed evolves secondary metabolites in its sap to deter herbivores. Milkweed herbivores evolved cardinolide sequestration to reduce its toxicity O Male water-striders evolve large grasping forelegs to improve mating success, female striders evolve carapaces to escape from males O All of the given options are examples of coevolution O Male deer evolve larger antlers to compete for mates, and female deer also evolve larger antlers because of a shared genome.
frequency of adaptive heritable traits in a population changes as REQUIREMENTS FOR NATURAL SELECTION TO OCCUR: 17a. Assuming that both types of pom-poms are present in the population, what do you think would happen to the pom-pom population if the black forest experienced a prolonged drought so all the trees died and the habitat became red grassland? 17b. Next, think about an alternative scenario. Suppose that natural selection over many generations had eliminated all the red pom-poms in the black forest habitat so only black pom- poms survived. After that, a prolonged drought resulted in this habitat turning into a red grassland. Would natural selection for pom-pom color occur? Why or why not? 17c. The above scenarios are showing that in order for natural selection to occur must exist within a trait.
The Chatham Islands are about 850 kilometers off the coast of New Zealand. One species of bird living on the islands, the black robin (Petroica traversi), in 1980 there were only 5 individuals left. Currently, there are already 200 black robins living there: all from a single pair. Using the "fingerprint" method of blood cell DNA, it was proved that all the robins of this species are genetically identical according to the studied gene sequences. They thrive here today. Even 70 percent young survive. And on the continent, only 42% of young Petroica australis survive.. a) i) What can you say about the taxonomic links between the Chatam Islands and the mainland robins in terms of the scientific names of these birds? ii) What could have ever influenced the separation of the two robin populations?

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Biology: Life on Earth with Physiology Plus Mastering Biology with Pearson eText -- Access Card Package (11th Edition)

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