What two evolutionary agents are most responsible for decreases in genetic variation in a population?

What will be an ideal response?


Genetic drift and directional selection.

Biology & Microbiology

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In specialized transduction, virtually any genetic marker can be transferred from donor to recipient

Indicate whether the statement is true or false.

Biology & Microbiology

Each of the following citric acid cycle enzymes is subject to allosteric regulation except

A) isocitrate dehydrogenase. B) ?-ketoglutarate dehydrogenase. C) malate dehydrogenase. D) fumarate hydratase. E) pyruvate dehydrogenase.

Biology & Microbiology

Assume that a cross is made between two organisms that are both heterozygous for a gene that shows incomplete dominance. What phenotypic and genotypic ratios are expected in the offspring?

A) phenotypic 1:2:1; genotypic 1:3 B) phenotypic 1:2:1; genotypic 1:1:1:1 C) phenotypic 1:2:1; genotypic 1:2:1 D) phenotypic 1:1:1:1; genotypic 1:2:1 E) phenotypic 3:1; genotypic 1:2:1

Biology & Microbiology

Osmosis occurs as water can cross the lipid bilayer through specialized channels for water movement called ________________.  

A.  proteins B.  transmembrane carbohydrates C.  membrane pores D.  aquaporins

Biology & Microbiology