Which Population of a Large Lake System Would Be Most

question 34

Multiple Choice

Which population of a large lake system would be most affected by the dumping of PCBs into the water? 

• A) algae 
• B) zooplankton 
• C) small fish 
• D) predatory birds

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Definitions:

Cystic Fibrosis

A genetic disorder that affects the lungs and digestive system, characterized by thick mucus production.

Dominant Allele

A dominant allele is a variation of a gene that will express its trait over another variant, known as the recessive allele, when present in a pair.

Recessive Allele

A variant of a gene that must be inherited from both parents to be expressed in the offspring, in contrast to a dominant allele.

Carriers

Individuals who possess one copy of a mutated gene for a recessive genetic condition but do not exhibit symptoms of the condition themselves, though they can pass the gene to offspring.