1. Natural Selection is responsible for the genetic changes thatoccur in the population that we refer to as adaptive evolution. Isall genetic change adaptive or can genetic changes that occurwithin population that are not necessarily adaptive? 2. How does sexual selection contribute to adaptive evolution? Whatis the benefit to the […]

A scientist is studying a species of gopher found in North America.  Population X lives in an area with hard packed soil, Population Y lives in an area with loose soil, and Population Z lives in an area with both hard and loose soil.   The gophers use their claws to dig […]

Puromycin is a powerful inhibitor of protein synthesis. It is an analog of the 3’ end of aminoacyl tRNA. When puromycin is added to a cell-free system containing all the necessary machinery for protein synthesis, incomplete polypeptide chains are released from ribosomes. Each such chain has py y uromycin covalently […]

The agouti locus in mice has three alleles: a is recessive and confers a black coat, A is dominant to a and confers an agouti coat, and AY is dominant to both and confers a yellow coat. AY is also a recessive lethal. In addition, the independently assorting c allele […]