All of the Following Are True of the Thymus Gland

question 81

Multiple Choice

All of the following are true of the thymus gland except that it

• A) activates B cells.
• B) reaches its greatest relative size during the second year of life.
• C) involutes after puberty.
• D) produces T cells.
• E) lies in the anterior mediastinum.

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Definitions:

Heterozygous

Having inherited two genes of different allelic forms for a trait.

Dominant Allele

The allele that is expressed when an individual possesses two different alleles for the same trait.

Recessive Allele

The allele that is not expressed when an individual possesses two different alleles for the same trait.

Carriers

Individuals who are heterozygous for a trait with a dominant and recessive allele and thus express only the characteristics associated with the dominant allele but may pass the recessive allele, including one for a recessive disorder, on to their offspring.