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.

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

Alleles that are both expressed in a heterozygote are _____.

_______________ 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.

Sickle cell disease and cystic fibrosis are_______________ whereas hypertension ____________________.

Consider a gene in a population where the dominant allele G occurs in 56% of the gametes. What is the frequency of the recessive allele?

In mice, the spinning behavior is caused by a dominant gene that affects the mouse’s equilibrium. This gene is lethal if two alleles are present. Two “spinning mice” are mated together. What are the phenotypes of the offspring and in what proportion?