In Darwin's time, natural selection was thought to be primarily negative. However, we have since learned that positive selection is a powerful force, and it

A) creates new gene variants that enhance the phenotype.

B) retains gene variants or combinations that promote successful reproduction.

C) enables people to resist infectious diseases.

D) enables us to alter our genotypes.


B) retains gene variants or combinations that promote successful reproduction.

Biology & Microbiology

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________ are insoluble polymers of aromatic alcohols that are primarily found in woody tissues.

Fill in the blank(s) with the appropriate word(s).

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The variable phenotypic expression shown in camptodactyly results from the interaction of ____________________ and ________________factors

Fill in the blank(s) with correct word

Biology & Microbiology

What structural characteristic allows sac fungi and club fungi to include larger-bodied species than other fungal groups?

What will be an ideal response?

Biology & Microbiology

Bcl-2 acts as a(n) ________ by promoting ___________

a) oncogene, cell division b) haplogene, cell division c) cancer gene, survival of potential cancer cells that would otherwise die by apoptosis d) oncogene, survival of potential cancer cells that would otherwise die by apoptosis e) haplogene, survival of potential cancer cells that would otherwise die by apoptosis

Biology & Microbiology