Directional Selection Is Best Described as

question 3

Multiple Choice

Directional selection is best described as

• A)all polymorphic alleles preserved in a population
• B)T-cell receptor interaction with peptide:MHC complexes directed to a planar interface
• C)a mechanism in T cells that is analogous to affinity maturation of immunoglobulins
• D)selected alleles increase in frequency in a population
• E)selection of most appropriate transplant donor directed at the identification of identical or similar combinations of HLA alleles compared with the transplant recipient.

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Definitions:

Scrap Value

The estimated residual value of a fixed asset at the end of its useful life, often considered when calculating depreciation.

Incremental Annual

Refers to the additional yearly impact or benefits resulting from a specific decision or action.

Payback Period

The length of time required to recover the cost of an investment.

Required Rate

The minimum expected rate of return on an investment, project, or loan, often used in evaluating its viability.