Suppose That Each Species of Galápagos Tortoise Has a Distinctive

question 85

Multiple Choice

Suppose that each species of Galápagos tortoise has a distinctive shell. Variations in shell size make some tortoises better adapted for defence. Imagine an island where many hunt on these tortoises; individuals with a larger shell would be more likely to survive and reproduce than would tortoises with smaller shells. These favoured individuals would pass on the genes that produce larger shells to their descendants, while those with smaller shells would not reproduce, leading to extinction. Which of the following would be most likely to drive this event?

• A)spontaneous selection
• B)hereditary selection
• C)natural selection
• D)artificial selection

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Definitions:

Cell Cortex

The outer layer of the cytoplasm of a cell, usually enriched with actin filaments, which helps to maintain the cell's shape and to facilitate cellular movement.

Actin Filaments

Thin filaments consisting mainly of the protein actin; actin and myosin filaments make up the myofibrils of muscle fibers.

Intermediate Filaments

Cytoplasmic fibers that are part of the cytoskeletal network and are intermediate in diameter between microtubules and microfilaments.

Dynein

A motor protein in cells which uses the energy from ATP to transport cellular cargo along microtubules towards the cell's nucleus.