The Sickle-Cell Allele Is Pleiotropic (I

question 22

Multiple Choice

The sickle-cell allele is pleiotropic (i.e., it affects more than one phenotypic trait) . Specifically, this allele affects oxygen delivery to tissues and affects one's susceptibility to malaria. Under conditions of low atmospheric oxygen availability, individuals heterozygous for this allele can experience life-threatening sickle-cell "crises." Such individuals remain less susceptible to malaria. Thus, pleiotropic genes/alleles such as this can help explain why

• A) new advantageous alleles do not arise on demand.
• B) evolution is limited by historical constraints.
• C) adaptations are often compromises.
• D) chance events can affect the evolutionary history of populations.

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Definitions:

Activity Cost Pools

Categories in activity-based costing that aggregate indirect costs incurred by multiple cost objects, allowing for more precise allocation.

Activity-Based Costing

Activity-Based Costing is a method that assigns costs to products or services based on the activities they require, aiming for more accurate allocation of overhead.

Activity Rates

The costs associated with specific activities, used in activity-based costing to allocate overhead costs based on actual consumption.

Activity-Based Costing

A costing method that assigns overhead and indirect costs to specific activities, improving costing accuracy.