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Characteristics shared by adopted children and their biological parents are mostly ____ while their similarities with adoptive parents reflect ____ influences.

Recessive illness causing alleles persist in heterozygotes in a population.

Bottlenecks are detrimental to the viability of a species because of the loss of genetic diversity and the potential risk for inbreeding and the expression of recessive genetic traits.

Bonus: The breeds of dogs is an example of artificial selection.

Human height in a population varies continuously in a bell shape distribution. ____________ and ______________ are strong environmental factors in expressing genetic potential for height.

Alleles that are both expressed in a heterozygote are _____.

Development of antibiotic resistant strains of pathogenic bacteria such as MRSA is due to evolution of the non-resistant strains to resistant strains.

_______________ traits are determined by more than one gene, with each gene providing a small, but additive effect.

In familial hypercholesterolemia, individuals homozygous for the allele causing the disorder completely lack receptors on liver cells that take up cholesterol from the blood stream. Heterozygotes have one-half the number of receptors while individuals homozygous for the normal allele are phenotypically normal. This is an example of _____.

Microevolution refers to changes in allele frequencies in populations.